haha no way, device still quite new and under warranty, dont wanna risk fixing it myself and void the warranty..

I can't seem to find it in the market, 

it hard to determine which is the best rom.it depend on which one suit your need
btw i use paranoid android with franco kernel

actually i'm also not understand much what is kernel.
in my understanding, kernel is something that control tablet/phone.
eg cpu clock speed.
there are kernel that maximize battery use,there also kernel for performance.
from what i'm read at xda,franco kernel is the best to maximize battery use.
u can google to find more about kernel

*high five* yea man... same here, just realised it is cracking/buzzing this morning

now i hav to root my N7 just to make a complete backup of everything before sending to asus, but dunno what i did, cant restore my backup so all my apps and data is gone (game high scores especially! FUUUU)

the good side is, now that is rooted, its much easier to do full backup from now on..
why must we root to do a full backup? screw u android!

Fear not, Service Center at lowyat will replace speaker for you free of charge.

Just yesterday got people say the speaker max volume see anime 9 hours a day also won't spoil.

The speaker issue is very real. Better dun use max volume to reduce risk of blown speaker.

i usually clear cache and dalvik just to be safe although it may not be necessary. if you use custom rom, they usually have their own kernel so everytime u flash the custom rom or a new nightly for that rom, it will revert back to that custom rom's kernel - you then have to reflash your kernel if you're using a custom kernel outside of that custom rom of course

go to your custom recovery (either CWM or TWRP) and click clear dalvik cache...it should be pretty easy to find that option to clear it...i'm using TWRP btw, CWM can't recall where it was..look around in the menus, you'll find it

How long they will take to replace that speaker.

Its abit weird, when it happened for the 1st the next day it come back to normal after been using for more than a week today suddenly its happened again.

In cwm under advanced
All Roms had their own kernel

guys, n7 3G supports nano-sim?

n7's battery life really impress me. didnt touch for half an hour the % still remaining the same. bravo! bravo!

A very good summary especially for those new to Android or simply do not know how to google search for such info

http://forum.xda-developers.com/showthread.php?t=1736578

here u will got all what u need 

Just download the any google stock image , eg nakasi-jro03d-factory-e102ba72.tgz
Extract it down all the way till you get say folder "image-nakasi-jro03d" and than you will see boot.img
Copy this boot.img in same folder where your fastboot commands are

Connect phone to PC in bootloader mode
At terminal command , flash it using fastboot commands

fastboot flash boot boot.img

Restart phone and you get back stock kernel - fast and easy
There is no zip file for such to flash in recovery mode. You can stop looking for it
Above steps is freaking easy - just a simple one line command