oliver, if it's not on the harware compatability list, the only way you'll get it to work is to find out if anyone tried to develop a driver for it, usualy my friend, webcams are not important enough of a peice of hardware to get specific drivers written for, I mean it's possible. but don't hold your breath.
What I would do is find a compatable brand/model of webcam, that meets your quality standards of imaging and functions - then seek that out on ebay and buy it used or something and have less stress.
while on ebay. sell that webcam that doesnt work in linux while you still got the documentation n stuff.
I usualy don't buy hardware unless I'm fairly sure it works in linux, Of course, like anyone, I have a bunch of various peices of junk modems and cards for various function that simply won't work in linux.. that pile collects dust, and of course - half of it I never even bought, it was pulled to replace with something compatable.
os[Linux F9 Fedora 9 release i386
cpu[Dual Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz 2194.569 MHz (Bogomips: 8779.42)
video[ MSI NX8600GT Twin Turbo GeForce 8600GT 256MB 128-bit GDDR3 PCI Express x16 SLI Supported Video Card (Dual Optiquest Q20WB LCD wide Screen Monitors