The iPhone 3.0 firmware preview event is over and we are looking at 100 new features coming and 1,000 new API calls for developers in the iPhone 3.0 SDK.
Registered iPhone developers can get the beta of the iPhone 3.0 OS including the SDK today.
The highlights in the new iPhone 3.0 OS include cut, copy and paste; MMS, landscape view for Mail, Text and Notes, stereo Bluetooth, syncing Notes to the Mac and PC, shake to shuffle, parental controls for TV shows, movies and apps from the App Store, and automatic login at Wi-Fi hot spots.
The iPhone OS 3.0 beta release will also include a new Voice Memo app and expanded search capability for all key iPhone apps, as well as Spotlight search across the iPhone or iPod touch.

The highlights in the iPhone 3.0 SDK for developers include In-App Purchases, Peer-to-Peer connections, an app interface for accessories, access to the iPod music library, a new Maps API and Push Notifications.

The new iPhone OS 3.0 software will be available to iPhone and iPod touch users this summer. iPhone customers will be able to download the new iPhone OS 3.0 software for free this summer and iPod touch customers will be able to purchase a software update for $9.95.
Via this Apple announcement.