OK so Beta 4 just hit and people are wondering what has changed? So far here is the list:
1. New wallpapers that are less busy and easier on the eyes so you can view your icons better.
2. Calculator, Clock, Compass, and Voice Memo apps are now in a folder called Utilities to free up some space on your desktop.
4. Tethering for AT&T users! I have had tethering options from the start because I have an officially unlocked iPhone 3GS on T-Tmobile. It looks like AT&T is now going to support tethering finally in 4.0.
If there are any other changes you notice please let us know. Also we still have a few spots open if you would like to beta test iPhone OS 4.0!