Hey, check this out! Greg Szczyrbak, one of the first people I knew who jumped on the Captivate bandwagon, pointed me to CaptivatePlayer: Delivering Captivate Content on the Web.
Basically it's a menu wrapper for Captivate Flash files- a simple way to organize and make them available to the end user. Looks pretty straightforward in the implementation, requiring only some text-editing to name the files that should appear in the dropdown menu. I haven't tried it yet, but in reading the instructions I'll betcha this could be used to 1) play any flash-based screencast files, and 2) as long as they were the same dimensions, and maybe even if they weren't, mix screencasts from different products! So if you experiment with two or three products, this would be a really neat and transparent way to offer them all in the same uniform way!
Looks like it'll be a week or two before I get a chance to play with it, but check out what Greg's done at http://library.millersville.edu/tutorials/cp/ (he notes it's still a work in progress). Gives me a chance to note Greg's use of a nice intro music clip to the first tutorial as well - I could see the right piece of music triggering a Pavlovian response in the student: "Hey, that's the library tutorial music - it's learnin' time!"