http://www.techwench.com/good-service-from-dimdim-web-conferencing-webinars/

There’s nothing at all dull about Dimdim; Dimdim 5.5. is the most recent offering from an institution whose focus is improving and helping meeting experiences online. It’s a very forward thinking solution, which combines Web 2.0 integration with features like audio and video conferencing, as well as desktop sharing abilities. It has more to offer in its resolution than the offerings of the more well knows names including Citrix GoToMeeting, retailing at $49, which does not support either audio or video conferencing; or WebEx MeetMeNow from Cisco, available for $39, which is still not able to support the Mac Operating System.