CamCamX 1.701 is now available for downloading. Included in this release are important compatibility updates for Snow Leopard. In addition two new camera mix-modes are included. Side-by-side CNN style (using this mode will bring in the A-camera "still picture" image as the background. And also Picture-in-Picture, which allows you to run more traditional news stories.
It's best to prep your artwork as 640x480 4:3 images for both performance and display.
Also, if you have Flip4Mac or Perian installed, more types of video can be used as sources.
Speaking of source video, check out keepvid.com - a site that allows you to download most youtube clips as .mp4. In general, MP4 clips are the best source format for CamCamX. We determined this experimentally by looking at the performance of various codecs. Sure, H.264 works great, but when you've got multiple cameras running and multiple webcam clients (Justin.tv and ustream.tv), it's more important to balance the CPU load by using traditional MP4.