http://www.macromedia.com/software/flashmediaserver/public_beta/?trackingid=CCOL
It says it’s free to download but i haven’t read the entire article yet.
EDIT//
It is a free trial like flash player 8 Beta. Mainly for people to test it out before the release.
Yes, the beta version will expire on November 18, 2005. After that, the product will not be usable.