HOW TO ROOT ANDROID PHONE WITHOUT COMPUTER

Yes you heard it right
The tool you require is

Z4root
Get it

Paste the file anywhere on your sd card,just make sure you remember where you have pasted it :P
Go to App drawer>Settings>Applications and make sure the box saying Unknown Sources is checked. (This basically means you're allowing the device to install applications from outside the market)
Install the market using any file explorer like ES File Explorer/Astro File Manager(duh)
Open the app (obviously) and click on the Permanent Root option.Note one thing here: Don't be tempted by the temporary root option,it made my device stuck in bootloop,though it may be specific to my device only.But it's surely not recommended as I found several other instances of this problem (I'll be writing a post on this soon).If you somehow get stuck in bootloop,drop a comment.
Open your fridge and get yourself a drink.When you're busy in the drink,in the meanwhile,phone will restart and...
YOU ARE ROOTED....

Next is
GINGERBREAK

WORKS ONLY ON 2.3 android phones

Therefore I recommended z4root

http://www.2shared.com/file/2DNV-Js_/z4root130.html

Link for z4root