Flash is going MPEG 4!
This was linked to from the FFMPEG developers mailing list.
http://www.kaourantin.net/2007/08/what-just-happened-to-video-on-web_20.html
It means that Flash is now becoming (more or less) ISO MPEG 4 (quite a few layers) compliant. This will leave WMP as being the only major player that doesn’t support MPEG 4 Simple Profile out of the box.