Thanks Mick. This is very helpful. Just wanted to sum up what Adobe said about this on their site:
" A critical vulnerability exists in Adobe Flash Player 10.0.45.2 and earlier versions for Windows, Macintosh, Linux and Solaris operating systems, and the authplay.dll component that ships with Adobe Reader and Acrobat 9.x for Windows, Macintosh and UNIX operating systems.
We are in the process of finalizing a fix for the issue, and expect to provide an update for Flash Player 10.x for Windows, Macintosh, and Linux by June 10, 2010. "
More information can be found in the links Mick posted, but essentially they are pushing out the updates at the end of the week, and Symantec is updating is heuristic detection to help in the meantime.
Cheers
Grant