Engadget has more: http://www.engadget.com/2009/03/17/apple-previews-iphone-os-3-0/
I wasn’t sold on the feature list … here’s a few:
[list][]Cut, Copy, and Paste
[]Spotlight
[]p2p over BT
[]MMS
[]In-app purchases
[]Fatter SDK[/list]
Mostly features from 1999 and more ways to gouge 13-year-old kids of their parents’ money.