Brandon Miniman of Pocketnow gives a thorough software walkthrough of the built-in apps in the Sony Ericsson XPERIA X1. Brandon discusses all the built-in and downloadable Panels on Part I, and shows the bundled Windows Mobile apps on the X1 on Part II. On Part II, make sure to watch around the 3:50 mark where Brandon shows why the XPERIA X1i works on the AT&T network in the US.

Part I - XPERIA Panels: