Jailbroke using quickpwn 2.2 the other day, in order to install an app I decided I couldn't do without:

Intelliscreen (USD9, I think) - turns the unlock screen into a "today" round up, similar to Windows mobile (the ONLY thing I miss since switching from WM6). Highly configurable to include calendar appointments, weather, RSS feeds etc.

Also installed Cycorder (free, requires jailbreak), which turns the iphones static camera into a video camera, with surprsingly reasonable quality.

Quickpwn jailbreak 2.2 is reasonably straightforward if you unload the iphone's applications first and then reinstall them via sync after jailbreak. It doesn't seem to work otherwise, if you have a lot of apps.

SB