A Mobile framework that lets you build your apps using web-standards technologies.
Also, using PhoneGap framework or PhoneGap build service, you can get access to native APIs on multiple mobile platforms!
With PhoneGap you get a bridge for web applications and mobile devices using iOS, Android, Windows Phone, Blackberry OS, WebOS, Symbian and Bada.
And on those mobile devices you can get access from your web-app to:
ACCELEROMETER,CAMERA,COMPASS,CONTACTS,FILE,GEOLOCATION,MEDIA,NETWORK,NOTIFICATION (ALERT),NOTIFICATION (SOUND),NOTIFICATION (VIBRATION),STORAGE
Read more about these great framework at http://phonegap.com