We updated the Android widget library to prototype mobile applications with Justinmind Prototyper and we added widgets from the 2.2 version and a completely new set of widgets to prototype the new Android 2.3 Gingerbread interface.
They are cool! Download them at Extras and give them a try! (Remember you need to have Justinmind Prototyper installed to use them). Select File -> Import -> Widget Library in your Prototyper and select the downloaded library, then you will have your Prototyper ready to create astonishing high interactive prototypes for Android.