Not Universal.

guns: This applescript will alow your QT Player to display movies in full screen mode:
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tell application "QuickTime Player"
     present front movie scale screen
end tell
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You can change the scale from 'screen' to 'half', 'current' or 'normal' if you want...
Just open the movie file in QT, then run the applescript - the movie will start playing in the full screen mode.

In addition to VLC, the Perian bundle for Quicktime lets quicktime play flvs too (and with less crashes than VLC). Of course Apple sucks for not just letting Quicktime go full screen without purchase.

You can download the (now Adobe) standalone flash player from their website:
http://www.adobe.com/support/flashplayer/downloads.html

I will give this one a try, but can anyone vouch for any real reason to use it?
edit: eh, not using it. It failed rather miserably on a game flash file (it doesn't seem to like transitions...).
Stick with the 'official' one. It works every time.

Who cares? VLC plays FLV files, too.