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That might be because Fedora Extras doesn't exist anymore?
There's now only Fedora.
Using a non-devel (i.e., FC6) Extras will mess things up.
BTW, I noticed in test 3 that you don't even need the flash 9 plugin rpm; you can click on the "download plugin" thingy in FF2 and it'll be set (to my surprise, actually).
I recommend always using the tar.gz, though.
Never trust packagers you don't know.
On a 'side' note, I think this looks like it will be a great Fedora release.