Telepresence (Read Free) Alternatives

In the challenged confines of SMBs no one should question that full-on teleconferencing with big screens showing life-size images are preferable but if these are not are there any options? In other words, are there free alternatives?

It turns out that there are options.

High-resolution video teleconferencing is available from Ekiga. Another possibility is to be found in shared whiteboards by Access Grid. And, last but not least is a 3-D graphics virtual world teleconferencing option from OpenSim.