When buying a webcam, I would avoid cheap Chinese knockoffs on eBay, even if they look really cool. Better to find a model that you like from a reliable brand like Logitech.
What do you mean? What does this camera have that others do not?
They're all over ebay.
I'd recommend what the guy above said though, just find a $30 webcam from a known brand, google it's model number and see how easy it is to get working with a mac.
EDIT: http://cgi.ebay.co.uk/12-0-Mega-USB...oryZ4616QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Thanks for pointing it out. I was doing some research, and it looks like the Xbox live cams work well. So I am going to try one out. Thanks for the help you guys.
I actually have a spare XBox Live webcam that I was going to throw on eBay. Interested?