Home Screen Search. Searches items on all your native iPhone apps.
Cut, Copy and Paste.
The holy trinity. To use CCP — double-tap to select text, drag from start to end points and select copy or cut. Shake the iPhone to undo/redo your edits.
MMS.
Nice, but when was the last time I got an MMS?
Bluetooth Stereo. With A2DP support.
Bandwidth throttling.
Adjusts streaming video quality according to current bandwidth.
CalDAV.
Allows for sharing calendar data across services like Google and Yahoo with .ics subscription support.
Tethering.
Share 3G internet via USB. Carriers will have to opt-in first for this.
The iPhone OS 3.0 will be free to all iPhone owners and cost $9.95 to iPod Touch users.