Using Quartz Composer for your Internet TV empire

The more I learn about Quartz Composer, the more amazing it becomes. Being able to make shiny cool things using drag-and-drop? Sweet. Well here's a nifty explanation on how to use QC to create realtime TV-style overlays on a video stream (or images). This is the kind of thing that made the Video Toaster famous. It's also a pretty amazing demo of the technology. What's so powerful about this? It's all that realtime goodness: blue screen, RSS feeds, and particle effects, which are great for "live" overlays... Unfortunately, you cannot send that live video out as a QuickTime movie or .dv file while you are capturing and overlaying the live video. You can capture and overlay live, but not send live. Kind've a shame, yet they do call it a "fake TV system."  If you're looking to get into QC, this is a great example with great documentation.