Apple posted a new video today called "Finger Tips" which demonstrates 10 tips/shortcuts for the iPhone. The video is embedded in their iPhone website:
1 - Silence the ring
2 - Delete a message
3 - Create your favorite list
4 - Assign a ringtone
5 - More song controls
6 - Browse in Cover Flow
7 - Magnify to edit
8 - Mail preferences
9 - Set a passcode
10 - Reset your iPhone
Apple's iPhone goes on sale today at 6pm local time.