iOS 4 Updating Checklist

A great site for developers who want to include all the iOS 4 features in their prior iOS 3 Apps.

iPhone Dev 101 - Updating To iOS 4

1. Create High-Res Icons for Retina Displays
2. Create High-Res Images (for Retina Displays)
3. Update For Multitasking
4. Ensure Backwards Compatibility