The WSJ has a post about the rise in video-conferencing:
Read original post - ''Telepresence' Is Taking Hold'
Thus far, standard videoconferencing systems remain a much bigger business. Despite these efforts, only about 1,000 of the 176,000 videoconferencing systems sold world-wide in 2007 were telepresence systems, estimates market researcher TeleSpan Publishing Corp. But unit sales of the high-end systems were up five-fold from the 200 sold in 2006, and the number should triple to 3,000 in 2008.