I´ve done a comparison of four cheap USB camera products made by that internationally recognised mega-brand, Ezonics.

They´re all well priced and look groovy. Two are plain webcams, one has extra "video phone" functions, and one is a dual-mode unit that can function as a self-powered still camera as well.

One of them is rather good, two are OK considering how cheap they are, and one is the worst webcam I´ve ever seen.