SIP & Video
Video has been done, Telephony has been done but neither have been done very well using SIP as the underpinning until just recently.
A few softphone companies will soon have a Video softphone, abiding by open standards using H.263 & H.264 codecs with SIP for signalling.
Video is quicking becoming all the rage in the SIP world, watch it explode in 2005.
WebRTC.is 