I've been unable to travel with my colleague for several of our XAMBUCA shows due to work commitments and lack of funding. Not one to miss out on playing a gig I wanted to explore a few options for networked video performance. After about an hour of trying various search queries I was able to find a clue via Vade's v00.info forum and cobble together a test and run it all off of one laptop.
Sending a mix to CamTwist via Quartz Composer Syphon plugin and then on to Skype.
We were able to use this set up live for the first time earlier this week during a performance in Portland, OR (I'm in Asheville, NC) and thanks to ample bandwidth on both ends I streamed a solid 720x480 20f mix without a hiccup for the 50 minute performance.