How To Use The Best 40 Features of iPhone 3.0
Here's a summary from iPhone Matters (with my picks in bold):
Over at iSmashPhone, they’ve provided a list and details of 40 cool new things to do with iPhone 3.0
1. Forward or Delete Individual Messages*
2. Email up to 5 photos at a time
3. Shake to undo and redo typing
4. Shake to shuffle
5. Copy/Cut/Paste
6. MMS*
7. Landscape Keyboard
8. Double click home button
9. Call history log*
10. Hold link in safari to copy/open in new page
11. Auto Fill Usernames/Passwords
12. Type new message while previous is still sending*
13. Spotlight Search
14. Voice Memos#
15. YouTube
16. Safari
17. Moving app across pages
18. Parental Controls
19. Share Contacts
20. New App Store View
21. Note Syncing With iTunes
22. Encrypt iPhone Back Up
23. Mail Search
24. Notes Search
25. iPod Search
26. A2DP Bluetooth
27. Turn By Turn Navigation
28. Tethering
29. In App Purchasing
30. Peer-to-Peer Connectivity
31. Find My iPhone and Remote Wipe (Mobile Me Users Only)*
32. Force Quit An Application
33. Retry failed text message (exclamation point next to text)*
34. Movies, TV Shows, Podcasts, and Audiobooks downloadable over 3G (no size max - this has been disputed in their comments)*
35. Playback audiobooks in variable speeds
36. Calls from non-contacts include city and state of origin (or city and country)*
37. Swipe to delete note in Notes
38. Album Art Displayed While Charging (instead of battery logo)
39. App Counter
40. Unlock and Jailbreak iPhone 3.0
* Not available on iPod Touch
# Requires external microphone on iPod Touch