You can go check out the status of your webcam here
. I have the logitech QuickCam Pro 4000 and the sound doesn't work either. I don't think they have developed the drivers for it yet.
Make sure you e-mail logitech, as I did, telling them that you are not happy that they do not make drivers for Linux. Tell them you will be using there competitors products from now on since there lack of support for alternative operating systems is null.