Android 3.1 builds and refines the tablet based user interface which was released as Android 3.0 ( Honeycomb ) and was also the first tablet-optimized UI from Google.

If you own an Android tablet running Honeycomb then 3G recommends you update to Android 3.1 at the earliest opportunity. The main improvements the update offers is : better memory assignment, slicker switching between programs and apps and any performance issues that existed have been eradicated.

Other key improvements are :

Improved multi-tasking and longer apps list ( recently used )

Support for more digital cameras, mice and keyboards ( USB peripherals )

Ability to size Homescreen widgets

Quick controls for tabs and web pages and HTML5 support

A full and detailed list of the Android 3.1 twists and turns can be found here.