class or conferencing software

discovere not free but cheap and hirable by the month
http://www.compued.com.au/conference/tour/
a description of how to use it can be found at this conference site, and a playroom, I think
http://intranet.usc.edu.au/wacana/isn2006/NOUS-IS-2006.html

ivisit, free
http://www.cnet.com.au/downloads/0,239030384,10487753s,00.htm

livve.com, free
http://www.livve.com/

Elluminate has a free meeting room accessible via www.learningtimes.net