Want to Root Your Android Phone?

For hacking Android device and why... Please Refer this...
How to Hack Your Android Phone (and Why You Should Bother)

For understanding Rooting and why... Please Refer this...
Some things you should know about rooting...

See this list Best Rooting Tools for Android Devices...

Rooting allows you to control nearly every part of your phone.

http://wiki.cyanogenmod.com/wiki/Howto:_Using_the_Recovery

Revolutionary
http://revolutionary.io/

Be sure to also install the appropriate Windows drivers that go with your phone so that Revolutionary can do its thing. Once the drivers are ready and you’ve downloaded Revolutionary, you’re ready to go.

Plug in your phone, set it to charge only and enable USB debugging. After that, just start up Revolutionary and follow its easy instructions.

At the end of the process, Revolutionary will ask you if you want to install a custom recovery framework, ClockWorkMod. It makes installing new kernels and ROMs very easy.

After that, you’re done. Enjoy that root, and maybe consider flashing a new ROM.
SuperOneClick

http://forum.xda-developers.com/showthread.php?t=803682

First of all you have to have the Android SDK debugger running. The SDK is free to download here. Once it’s running, connect your handset, enable USB debugging, and make sure the SD card isn’t mounted to the computer.

Start SuperOneClick and click root. That’s it. If the program says “Success” at the bottom of the scrolling text, you’re rooted. Reboot your device and go download some root apps.
Universal Androot

http://forum.xda-developers.com/showthread.php?t=747598

Check your official Android version in Settings. If it’s 2.2 or lower on the devices below, then you can use the app Universal Androot which does it for you.

Unrevoked

http://unrevoked.com/