Thanks for the quick reply. Nefsis is only presenting me with options that go up to 640 x 480, so I'm assuming this means that Nefsis has determined my system is not capable of higher resolutions. I have enough bandwidth (15MB up, 25MB down) and the camera is a Logitech 9000 so it is capable of higher resolutions.

Is there some way of knowing what are the limiting factors? CPU or memory? USB speed?