Ruffle Cat is a raffle app for iphone.
See it in action here : http://rufflecat.appspot.com.
I wrote it after the August 2009 Indypy, the Indianapolis Python User Group, meeting as an "upgrade" to an existing console raffle script that was running on a fellow pythonista's iphone. We use it to give out door prizes at the end of every meetup.
I used iui User Interface framework.