The section of the Microsoft Developer Network dedicated to the Build event where you can get any sessions you might have missed: http://channel9.msdn.com/Events/BUILD/
Of course, Windows 8 wouldn't be the same without one of the best, if not the best, frameworks for MVVM development, MVVM Light, which you can grab from http://mvvmlight.codeplex.com/
Laurent Bugnion's blog also has an interesting post related to Windows 8 development at http://blog.galasoft.ch/
Additionally, you will find some interesting posts about Windows 8 in my blog http://silverlightguy.com