This is the Sony Ericsson XPERIA X10 UI walkthrough that the guys over at gsmarena made with the press sample they got.

While lots of manufactures has already jumped on the Android bandwagon this is the first one for Sony Ericsson and it does sport some nice high end hardware like 1 GHZ  snapdagon processor or the 4″ TFT screen with 480×854 resolution and we can’t forget the impressive 8.1 megapixel camera with autofocus.
The UI is said to be quite impressive and if you look at the video you can see that the UI called UX (User eXperience) is quite impressive but it has quite big flaws.
Expect to see the device soon in stock around the world.