I've said this before, and I'll continue to say it again.
for good motion graphics, we need a GUI that uses a GPU, OpenGL or DIrect 3D or similar. OpenGL would be ideal as a port to linux and Mac is more possible.
I beleive MythTV uses some OpenGL, so there might be a place to start, but let sbe honest, flash is cool and all, I develope in it, but for those "cool" graphics .. like on video games, flash is all CPU.. so it sucks the big one.
The only issue I forsee is maybe "embedding" in it .. but it might be cool to try and use Tiger data or buy NAVTEQ maps and make a full bown GPS app, (not saying it's possible, or even worth it). It might be cool to lay topigraphical maps on a 3d plane and merge that with road maps and navigation in a 3d environment.
Anyway, nothing against the original poster, just throwing more than my fair share into the thread. Ok I'll get back to not practicing what I preach and work on my flash animations.