Some of my colleagues have started what's called "Architect Point of View" blogging. Within each POV blog architectural views and thoughts on a selected subject are discussed and shared in a 10-15 minute screencast or video presentation. Check out some of their POVs below.
Adopting Silverlight, by Bob Familiar
Choosing the Right “Flavor” of LINQ, by Bill Zack
Parallel Extensions for the .NET Framework - ParallelFX, by Jeff Barnes
Give it a try and let us know what your experience is.