This USB WebCam from DSE, (product code XH5096) sold as "Internet Camera with Microphone", supports 640x480 resolution images at 15fps, and video at 25fps, according to the box.
The 2.6 series LinuxKernel (as of 2.6.7 at least) come with support for WebCams that use the similar OV511 chip, but not these WebCams.
The camera's built-in microphone is detected by the kernel's USB ALSA drivers, but it doesn't actually seem to work - a new sound device is registered (/dev/dsp1) but reading from this device doesn't do anything.
Best bet (for now) is to get a camera with better Linux support.
See OmniVisionWebCam for more details