My Creative NX webcam seems to work out of the box with the gspca driver, but initially I had trouble getting a proper picture in Camorama. It seemed to be cropped down to only a small portion of what the camera can do, and the colors were all wrong, giving the image a strange blueish tint. The color and hue adjustments didn’t help.
Playing around with Camorama’s parameters I found that starting the application from the command-line with camorama -M gives me a full-sized picture. I have yet to discover how to apply the same to Ekiga, which has the colors correct, but the same thumbnail-sized image problem.
As for the color problem, there was a helpful hint at Launchpad: adding the Color correction filter in the Effects portion of Camorama’s window (Ctrl+E brings it up if it isn’t showing) fixes the issue.