Several people generously posted suggestions to my blog, and I want to publicly acknowledge Jeff Crossett, Carl Tyler, Tanny O'Haley, and Michael, for their helpful input.
Here's a quick test embedded screen movie that I put together, to demo the embedded video.
Tanny tells me that this solution will work across all browsers and all operating systems. Soon,we hope to be able to add player controls to the page, similar to what Camtasia provides. For now, however, I can begin to include screen movies on this blog.
Let us know how this test works in your browser. Feedback welcome.
PS. Perhaps I could find a way to drop a subtle hint to Steve Castledine to include this code into DominoBlog, so that it will be a one-click operation. That would be sweet!