I know!
We are not alone:
https://bugzilla.redhat.com/show_bug.cgi?id=439858
Well, I did get it to work eventually... let's see.
You have to get it from the adobe site, and then make a link to the plugin directory:
I think this worked (just don't copy the 'mozilla' typo:
http://hacktux.com/fedora/9/flash
And I think you need 'libflashsupport' to get sound. This one should be in the repos though.