This is just a heads up
I took the trouble to nag adobe about the lack of a 64 bit plugin. I pointed out that it was a trivial thing to compile on a 64 bit machine, instead of which they want us to junk all the 64 bit software from gxine, sun, mozilla etc, just to use their 32 bit plugin cos they were in tha last millenium. I pointed out the difficulties with automated installers and remarked that they wouldn't ask windows users to hack their machines!
To my immense surprise I got a reply that they have an alpha 64bit Flash 10 plugin (not official, not supported, etc. etc) on their site at
http://labs.adobe.com/technologies/flashplayer10
This installed and worked for me on slamd64-12.2. I trust it will save a bit of farting about with 32 bit browsers. They say it's alpha
which means: "if it's broke, patch it and tell us what you did" but they don't provide the source :-/.