I’d agree – the latest version of the Flash video CODEC – VP6 is stunning and pretty well eveybody can play back Flash content. If I were in your shoes I’d go down the Flash route.
The BBC haven’t adopted it (yet) because of the massive investment they made with Real ages ago but just look at YouTube, google video etc..
Streamed Flash also addresses copy protection issues nicely without getting wrapped up in the mess of Windows media DRM.
Video AllSorts