the only 1 TB notebook hard drive i know of is from Western Digital, but it's a 12.5mm model instead of the more regular 9.5mm...meaning it wont fit in a MacBook. another 1 TB notebook drive is from a brand named Pure Silicon, but its an SSD. and very expensive . i believe what u meant by 'cpu-like' hard drives are the big ones? you can just call it a desktop HDD..the proper name is 3.5" HDD. Notebook drives are 2.5" HDD. there are also 1.8" HDDs.

most computers today (actually, i think ALL computers) use SATA (serial ATA). ATA (its normally called PATA or IDE) is a very outdated technology. however some shops still sell IDE drives, so be careful. anyway, your best choice now is to upgrade to a 500gb HDD because its widely available and of very good value (around RM280). a lot of us here (including myself) are using a WD Scorpio Blue, another good one is the Hitachi TravelStar 5k500.

about bootcamp, AFAIK bootcamp is for internal HDD. running another OS from USB would be very slow.

i don't mean to offend, but try to learn more on these stuff before you spend ur money on it. i'm just concerned if a shop try to con you. to summarize, what you should be looking for is a 2.5" SATA HDD, the 9.5mm variant.

and yes, both RAM and HDD can be upgraded yourself, but make sure you know what you're doing

You should get DDR3 1067MHz SODIMM. 1333MHz is also backward compatible. But your mac will only run at 1067MHz.

As of HDD, the faster the RPM, the faster the drive access and write files. In layman terms. But many cases it's matter of seconds or minutes. 7200rpm drive for laptop also come in smaller capacity at the moment. 320GB WD Black is the common one. The 500gb n 1TB drive you seek is still at 5400RPM only.

How much you bought for the 1pc of 2GB DDR3 ? cause I see the price is increasing..
By the way, I upgraded my HD to 500GB WD Scorpio Blue (Model : WDC WD5000BEVT-22ZAT0) .. till now no problem..

i'd been using win 7 for few moments rite now,playing games.. no problem at all with the drivers of windows 7 as new macbooks using nvidia graphic and intel proc. the only driver that i can't install rite now's the isight driver.the windows can't install it properly. others, all running very good. played PES2010 with no problem at all.

Time Machine backs up an exact total copy of your current drive with nothing left behind (unless u specifically say what you don't want to backup).
To restore just change the drive, plug in your time machine backup drive, then use the DVD, start the installer, and restore from time machine and it will look exactly like how it is before.

I'm not sure where changes Mac hardware, I changed mine myself.

Nope you don't install Snow Leopard again. When you restore, it just copies your entire backup (including your OS, so all your settings still remain) back to your newly inserted HDD, which will take some time depending on both drive's speed and the size of your backup.
(Mine took about 2 1/2 hours with 7200rpm internal, Firewire 800 External. Mine's probably very big.)

You CAN install SL and then restore, but I'm not too sure what will happen to your settings, I've never tried that.

You just restore. Don't have to install again.
Firewire 800 is backwards compatible. You can get a cable that looks like this:
9pin to 6pin cable