Here's a neat video that completely skipped my radar.

Here is Google demoing the Android 3 UI with their upcoming music app!
http://www.youtube.com/watch?v=dttyQo3BPrk

Things to note about the UI in this demo:
- The background isn't a solid colour but a raster. This is a VERY cool enhancement that will be well utilized for some very funky effects and unique app look and feel.
- The background is fully parallax scrolled. Much like the Android homescreen or maemo5 homescreen, the foreground scrolls at a different rate than the background! Very slick.
- It is almost certainly hardware accelerated to be running at these interactive rates, which will mean a buttery smooth experience.
- Swiping the the side can navigate between tabs (ala the new Youtube app)

It's actually interesting, that the UI has a lot in common with the upcoming WP7 UI, as it features similar styling, though is seemingly not as constrained.