This talk is all about writing a connected app for the Windows Phone. The talk covered:(1) Azure/WP7 toolkit for the server-side of the phone app. Most good phone apps will need some kind of server-side component, be it for live tile updates or just to form a social community.(2) XNA for the phone app itself (a Breakout clone) using the new Mango (7.1) phone tools, (3) Async language feature which makes it much easier to program how the app communicates with the server -- in this case to download high-score table.
The material here is in VB, but it all works equally well with C#.