Ever wanted to do capture a webcam data stream and save it to a WMV file? The UberDemo blog over at the MSDN blogs shows you how to accomplish just this. They had to create a Cirque du Soleil demo for MIX '08 and shows the basics on how to do this. They do note this isn't a production quality sample but shows some value on how to do everything.
Now the demo does have some installation requirements and installation steps so be warned.