Webcams and Linux always lacked good drivers. One of the main problems was the missing standard for USB cams. Now this standard exists. It's called "USB Video Class (UVC)" and you can get the spec here.

And a Linux driver is already work-progress. Logitech seems to be the first vendor being compliant to the standard. The Quickcam Fusion, Orbit, Pro for Notebooks, and Pro 5000 are supported. Guess one of the cams is the one I'm gonna buy.