As well as the access that the web runtime (WRT) already allows, PhoneGap supports geolocation, accelerometer, camera, vibration, contacts, SMS, sounds, orientation change, storage and network availability.
Launched in April 2009 at the O’Reilly Web Expo LaunchPad competition, the open source solution has racked up 200,000 downloads, and should make applications that span multiple devices easier to code. While it’s not a magic wand that lets your apps work on every smartphone out the box, it will reduce the time to port and test code.
More at the Symbian Foundation and PhoneGap.