Peter Torr posted the sample code from TechEd New Zealand talks where you'll find a lot of interesting information on
Windows Phone 7.
Source: Peter Torr's Blog
These are the latest revs of the “Building WP7 Apps in Silverlight” talks that have been given at Mix and TechEd US in the past. They should run on the current beta tools (and not long now until the RTM tools are released!). A lot of the demos use device features so you will not get the full benefit in the emulator. I will also post the “no code; all Blend” panorama apps in a separate post (they will have to wait until September 16th).