Hi Laurence,
Yes, I also enjoy taking the Moon (my all time favorite celestial body for all kinds of reasons) with a webcam.
Now, amateurs are aware of ways to trafic those webcams so that they produce long exposures, needed for deep sky photography (or aquisitions as they say).
The Canon EOS 10D is great apparently, because it produces very little noise (hot pixels) when a long exposure picture is taken.
But all this also depends on the stability of the telescope, and the ETX90, while ok for planets and the Moon, is a different matter for much fainter objects.

It all depends on where we find our satisfaction, of course.

Raoul