CNN called it a hologram but it is not a true hologram.
The reporter was in Chicago and surrounded by 35 cameras. But the CNN viewer saw what appeared to be a live person standing in the studio with Wolf Blitzer.
There is an interesting article at: http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1980
The article has an embedded Youtube video. I did not see this live when it happened but the Youtube video is amazing to me. I think this is an immensely interesting development. The Youtube video is embedded below for your viewing pleasure in case you want to omit reading the article:
Saturday, November 8, 2008
at 5:00 AM