[mikegi]

Have you seen the incredible shots out on sci.astro.amateur? Here's one I found:

This guy is using a digital camera, not a webcam. Try strapping a high resolution Digicam to your scope.

[Joe Hadenuf]

Certain commercial digital cameras will work. But CCD imaging cameras are the way to go, specifically made for amateur scopes. A little pricey, but worth it. The webcams are good for brighter images like planets, lunar surface, the sun etc.