Not sure about which webcam to use, but this software is fantastic:

http://www.at32.com/doc/comcam.htm

It's got loads of effects such as bluescreen effect etc so you can do things like this with it:



Erm, if you want to
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...