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Speaking of both the iMac and the Skype Studio, the key piece of software that makes it all run is Boinx TV. It's a silly name, but it does dynamic, live post-production, while the show is going on. I've used it to record almost all of the DavidGewirtzTV programs.
What I like: Amazingly capable for a single program.
What I'd like to see: A little more programmability in the interface for switching sequences. I've also run into some sound problems that are probably not BoinxTV's fault, but still continue to dog me as I refine the studio.
Find it here starting at about $499. There's some kind of home version for about fifty bucks, but I've never looked at it. If you're doing dynamic video production, spring for the full product.