Hi Barry.
I'm still green to all this too, but apparently if it has the CMOS sensor rather than the CCD sensor, word has it that they don't perform too well as an astrophotography camera. (all to do with light sensitivity)
But I would'nt be letting that stop you from trying. You have nothing to lose by trying it out.
A couple of links to check out:
http://homepage.ntlworld.com/molyned/web-cameras.htm :
http://homepage.ntlworld.com/molyned/CCD-STUFF.htm