This quarter I took a computer networks class where we created a VOIP client for Android, and I must say I'm very impressed with the API. Those of you familiar with Java and Eclipse should definitely take a look if you're interested; by now Android is very well documented and is emerging as the primary competitor to the iPhone.
Anybody considered making games for the iPad? Using that big screen for an RPG would be killer! I'm really impressed with the iPhone apps you guys have been creating here. Why not polish them into a final product and sell them for a buck or two on the app store?