It does run on Mac Mini servers. We don't use VNC, but rather our own approach to make it work. We used to be called Kickfolio, and this Quora thread has a nice response from one of our other co-founders, Chris. http://www.quora.com/How-Does-X-Work/How-does-Kickfolio-work...

I was about to ask the question "Why didn't you use the video element" - answered well within the link (if anyone has the same question)