Sounds great! Skype with screen sharing. The guys have read my mind (even before I did) – this is something really useful.
Mac OS version here:http://www.skype.com/intl/en/download/skype/macosx/beta/
Do I still need webex?
Skype 2.8: Screen sharing, wow!
http://www.skype.com/intl/en/download/skype/macosx/beta/