but I wonder if it would be usable by a typical non-geek user

I'm working at one of the largest chip design companies, so you can assume that the engineers around me have a sound understanding of technology (I mean we know how to use all the EDA tools, if there wasn't SAP software I'd say that's the most complicated software you can get :). We use WebEx heavily for intra and inter company communication. Still many of us have trouble using it, and explaining its workings to first time users almost always takes a lot of time (and nerves!).

I'm eager to have a look at OpenMeetings. But assuming it already has all the needed corporate functions I'd say concentrating on usability (especially for new users) would be a major differentiation factor to other products in this space.

You can also try BigBlueButton: http://www.bigbluebutton.org/

Thanks. This looks like a winner.

My mentor works at http://www.salescrunch.com and from what I've seen they have came up with a very slick replacement for WebEx.