I got a webcam for doing conferencing at work and wanted to do some development with it. I had the problem of the sample source code I would try out didn't work. These were examples using WIA.
THEN I found Mark Schmidt's awesome vista gadget using a webcam. His example uses DirectShow to interface with the camera instead of WIA. I asked for the source since it was an .Net application and it the fact it actually worked. Mark cleaned it up and graciously posted it for everyone to check out.
Finally, I'll be able to entertain myself by making weird faces.