iPhone Jailbreaking

Has anyone here jailbroke their iPhone?

If so why, and what apps did you get? I just did it to mine and am using Cydia and Icey for the apps, so far the only cool thing is being able to reskin the iPhone with different themes

 

Sounds interesting but unfortunately im not lucky enough own one. I like the idea of skinning one, I used to spend ages years ago theming Sony Ericcsons