Most webcams should work.
We have tested and found most Creative webcams work. In particular we find the Creative Optia plug and play webcam to work very well.
You can buy this camera from amazon.com
Most inbuilt laptop webcams work well.
Currently a few problems on the Logitech E3500 series of webcam
If you find any other webcams that work, please post on this forum and we will add it to the list.