iPad

Here is a quick list with Apple’s guidelines on the iPad User experience (alpha ordered):

1. Add Physicality and Heightened Realism
2. Always Be Prepared to Stop
3. Ask People to Save Only When Necessary
4. Consider Multifinger Gestures
5. Consider Popovers for Some Modal Tasks
6. De-emphasize User Interface Controls
7. Delight People with Stunning Graphics
8. Downplay File-Handling Operations
9. Enable Collaboration and Connectedness
10. Enhance Interactivity (Don’t Just Add Features)
11. Flatten Your Information Hierarchy
12. Minimize Modality
13. Reduce Full-Screen Transitions
14. Restrict Complexity in Modal Tasks
15. Rethink Your Lists
16. Start Instantly
17. Support All Orientations

Hit the UX or iPad SDK for more details