Integration of film and games.

I've watched machinima on Mogulus before but now Procaster claims to have the ability to stream live MMO games over the internet from a desktop and incorporate media with ease to over 100,000 viewers, while opening chat windows and such even. The text seemed easy to read on my moniter. I find this interesting and I think I should try it out.

 At a glance, it seems that this might make broadcasting an interactive show a little quicker and easier. With the players/audience ready to influence the storyline live if they choose.

 I find using game engines for productions fascinating, do any games or sites encourage or allow such machinima experiments?