Sony 3D sweep panorama functionality - you can take panorama shots and watch them (in 2D) on your phone, (in 2D) on your HTDV or (in 3D) on your 3D HDTV
Screen capture - grab a screenshot anywhere from your Xperia
Enhanced Facebook integration
Google Talk with Video Chat (for Xperia phones with front-facing camera)
Swipe text input - works just like Swype, but it's called T9 trace
USB on-the-go functionality - it works only when you've connected your Xperia phone to the Sony Ericsson LiveDock. It supports wired and wireless USB accessories such as keyboard, mouse and gamepads. There is no word on USB drives support yet