I would imagine is revolves around developing a backend to handle the GIS data (through ArcIMS?). Once you got that in place, you can just bring that formatted information into flash in whatever way you need it to be and do whatever you want with it.
Who’s doing it now? Anyone you know? Does google know? Does it serve a purpose for those tree hugging, short-wearing geeks? 1… 2-hooo!, 3. CRUNCH. The world may never know.