Source: http://forum.xda-developers.com/showthread.php?t=741491

Overall:
- It's faster
- Radio now has RDS support. (Found by thpoul)
- Dialer has new Android robot, kinda 3D looking one now.
- Now vibrates on shutdown (Found by Domsdey)
- Screen can now also be rotated to the right! (Found by martintzvetomirov)
- New Task Switcher when holding Home button. Displays 8 apps instead of 6. (Found by steve228uk)
- Android Cloud to Device Messaging support, Eg. ChromeToPhone to send links, maps directly to phone from chrome/firefox browser (Found by psycop)

New Apps:
- Launcher has been renamed from All Programs to All Apps (Found by steve228uk)
- HTC Share App
- News & Weather
- Videos
- Voice Search
- WiFi Hotspot
- Torchlight
- Search (Google)
- Pictures renamed to Gallery

New Widgets:
- Calculator Widget (Found by jaymit)
- FM Radio Widget (Found by martintzvetomirov)
- Market Widget (Found by jaymit)

Settings:
- Wireless Networks contains settings for WiFi Hotspot
- New seperate menu for Screen settings.
- App screen is split up in 4 tabs: Downloaded | Only actived | All apps | On SD-Card
- New screen for speech.

Lockscreen:
- It's no longer possible to unlock the slide-down screen by pressing menu. (Found by kevano22)
- The screen unclock sequence can be set to engage after some minutes, or immediatly. (Better formulated by elek_it)
- Can now be a pattern lock, PIN lock or an alphanumeric password
- The lock pattern has grey middle buttons instead of black.
- Instead of just the time of the next alarm time. It also shows which day.

Keyboard:
- Keyboard now allows for Chinese input
- Keyboard now allows for quick language change.
- User dictionary no longer jumps to top when editing a word (Found by jaymit)
- Seperate screen for deleting user dictionary words, allowing for batch deleting.
- Bug: Pressing spacebar if keyboard is set to Russian (Pусский), will display an exclamation mark "!" instead of a space (Found by monsterfly)

Calendar:
Facebook events and birthdays are available in calendar. (Found by Sikacik)

Camera/Camcorder:
- Camera icons now rotate along with a smooth animation when rotating the phone (Found by @MARK)
- 3 codecs to choose from: H.263, H.264 and MPEG4
- 720p Recording possible with MPEG4 Codec.
- Flashlight can be set on during video recording. (Found by monsterfly)

Contacts
- Option to automatically send someone directly to voicemail now. (Already in 2.1 according to Bouncer5)
- Facebook tab has more features (Found by Mike1988)

Messaging:
- The bottom box to type text is bigger.
- Now shows how many characters you have left from the start.
- New icon for send.
- New icon for attaching something.
- Scrolls smoother when a conversation has a lot of messages.
- Bug: UTF-8 issue with Greek sms still exists. (Found by thpoul)

Browser:
- Adobe Flash 10.1 support is built in (make sure plugins are allowed in settings!) (Found by martintzvetomirov)

Gallery:
- Icons from the Sharing menu are smaller. In portrait mode, all are visible in 1 view.

Gmail:
- Labels now have same color as those in Gmail on the web. (Found by @MARK)
- Now displays your email adres all the time in the upper-right corner.
- Displays a small icon of the person that send the mail if you have them in your address book.
- When viewing a mail, there are now buttons to go to the next and previous mail.
- Can copy text to clipboard now via menu button.

Google Talk
- New interface
- Don't know of much more, I don't use GTalk.

Market:
- New option to allow automatic updates. (Found by jaymit)
- New seperate tab for app comments.
- Can now mark comments as: Useful, not useful and spam.

Music Player:
- When no cover available, the music note is now green.
- Pressing next has a much smoother CoverFlow animation
- Genres are fixed now.
- Pressing the left-button to open up the menu happens much faster.
- Shuffle seems better (not sure, but don't bump into same song that often anymore).

Physical
Size:

Weight: 135 grams (4.76 ounces) with battery

Display
Type: AMOLED capacitive touch screen with pinch-to-zoom capability
Size: 3.7 inches
Resolution: 480 X 800 WVGA

CPU Processing Speed
1 Ghz

Platform
Android™ 2.1 (Éclair) with HTC Sense™

Power & Battery
Battery type: Rechargeable Lithium-ion battery
Capacity: 1400 mAh
Talk time:

• WCDMA: Up to 390 mins
• GSM: Up to 400 mins

Standby time:

• WCDMA: Up to 360 hours
• GSM: Up to 340 hours

Storage
ROM: 512 MB
RAM: 576 MB
Expansion slot:

• microSD™ memory card (SD 2.0 compatible)
• Supports up to 32 GB

Camera

• 5 megapixel color camera
• Face detection capability
• Auto focus and flash
• Widescreen photo capture
• Geotagging

Connectors

• 3.5 mm stereo audio jack
• Standard micro-USB(5-pin micro-USB 2.0)

Sensors

• G-Sensor
• Digital compass
• Proximity sensor
• Ambient light sensor

Network Bands
Europe:

• HSPA/WCDMA: 900/2100 MHz
• GSM: 850/900/1800/1900 MHz

Asia Pacific:

• HSPA/WCDMA: 900/2100 MHz
• GSM: 850/900/1800/1900 MHz

Internet

• 3G:
  Up to 7.2 Mbps download speed
  Up to 2 Mbps upload speed
• GPRS: Up to 114 kbps downloading
• EDGE: Up to 560 kbps downloading
• Wi-Fi®: IEEE 802.11 b/g

Tethering
Internet sharing through USB

Bluetooth

• Bluetooth® 2.1 with Enhanced Data Rate
• A2DP for wireless stereo headsets
• FTP and OPP (object push) for file transfer
• Other supported profiles: AVRCP, GAP, GOEP, HFP, HSP, PBAP, SPP, Service Discovery Application Profile

Location

• Internal GPS antenna
• Google Maps
• HTC Footprints™

Multimedia

• Photos application for viewing photos and videos
• Music
• FM Radio
• Audio supported formats:
  Playback: .aac, .amr, .ogg, .m4a, .mid, .mp3, .wav, .wma
  Recording: .amr
• Video supported formats:
  Playback: .3gp, .3g2, .mp4, .wmv
  Recording: .3gp

HTC Widgets

• Bookmarks, Calendar, Clock, Footprints, Friend Stream, Mail, Messages, Music, News, People, Photo Album, Photo Frame, Search, Settings, Stocks, Twitter, Weather
• Downloadable widgets

Social Networking

• Facebook™ integration
• Friend Stream
• Photo sharing on Facebook, Flickr, and Twitter
• Video sharing on YouTube™
• HTC Peep for twittering

Recommended Windows System Requirements

• Windows® 7, Windows Vista®, or Windows XP
• HTC Sync

Special Features

• Automatically lowers the ringer volume as soon as the phone is picked up
• Mutes the ringer when the phone is flipped face down
• Backs up certain data and settings to the microSD card automatically, such as SMS/MMS messages, bookmarks, Wi-Fi passwords, and more

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Let me try to explain this with my limited knowledge. I know nothing about Linux/SD ext etc until I bought my Nexus 3 months ago. By default all apps will be install in main memory. However Google had said the latest ver 2.2 will allow apps to be install onto SD card - this is native apps2sd. To be able to have apps install to card , the developer of the apps must built in this option for you to choose during installation. As of now many of the apps still do not have this option and the apps will be install in memory even if you are on ver 2.2 Android/Froyo.

Before ver 2.2 was released, many of the rom cooks customize the rom of previous ver 2.1 and even present ver 2.2 to allow you to "force install" onto the SD card - if you were to read into the details of the roms, usually 2 types - install directly to sd card ( ie on the FAT32 portion ) or install onto extended partitions , commonly called sd ext. Before you can use sd ext partiotion, you must partition your sd card first - there are several methods , the easiest is to use custom recovery. Using custom recovery you firs select the swap size, then the size of the extended partition, default is ext 2 - normally most people will use 512 MB upwards ; I use 1024 M. Once you have create this ext 2 , you can immediate upgrade it to ext 3 ( with journalling features). I notice most rom cooks will ask you to setup ext 3 , only a minority will be ext 4. These extended partitions you cannot view it in your computer as is hidden ; similarly in the phone using the file explorer , you cannot see it. Installing apps into the sd ext is the most popular method so far used by the various rom cooks.

for those rom that are customized to allow you to install directly on the SD card - you can view all the files/apps. In my various trials of the different roms, I find that apps install to sd ext is most reliable, can say is 100 % reliable. For roms where you force install on the sd card directly ( so called native apps2sd), depending on rom , sometimes some apps are not display when you put it out on the homescreen - what you see is just a blank image , but the link to the app still work. I believe this issue is only temporary until the apps are modified to allow installation directly to the card

Maxis APN
1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name = Maxis(3G)
APN = unet
Username = maxis
MMSC = http://172.16.74.100:10021/mmsc
MMS proxy = 202.75.133.49
MMS port = 80
APN type = default,mms
(Others, leave blank)

DiGi APN
1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name : DiGi Internet
APN: diginet
MCC: 502
MNC: 16
APN Type: default
(Others, blank)

DIGI MMS
APN: digimms
username: mms
password: mms
Proxy: 203.092.128.160
Port: 80
MMSC: http://mms.digi.com.my/servlets/mms
MMS Proxy: 203.092.128.160
MMS Port: 80
MCC: 502
MNC: 16
APN Type: mms

Celcom APN
1) Home -> Menu -> Settings -> Wireless & networks -> Mobile networks -> Access Points Name
2) Menu -> New APN
Name : Celcom 3G
APN : celcom3g
MMSC: http://mms.celcom.net.my
MMS Proxy : 10.128.1.242
MMS Port : 8080