Jailbreaking

"Jailbreaking is the most beautiful thing you can ever do to your iDevice."

Jailbreaking is a process in which the user can hack into the software of the iPod Touch, iPad or iPhone, and download more apps for free (only if you got Installous). They can also change the appearance such as the background and add themes. Some support for customization such as changing backround has been added into iOS 4.

If you are running iOS 4.2.1 on anything else other iDevice other than an iPad 2, got to http://www.greenpois0n.com/ and follow the instructions.