useful for beginners

http://www.appsamuck.com/

I stumbled across appsamuck a while ago... they've been writing a small iphone app a day for 25 days now, some of them are even on the store, though they're pretty much useless as practical things. Their goal is to write 31 small apps, and put them up with the source available to download so that people trying to learn can learn various things. They're two days behind, but they still have plenty up already... check them out maybe one of their demos will be useful to you!