This tool might apply to the Flash support dilemma, but I've already found it useful as a way to pull content out of YouTube. The tool I'm talking about is a terminal command CLIVE
Folks on Debian/Ubuntu should be able to find this in the repos with sudo apt-get install clive. For Arch users, this is called cclive so you'll use pacman -S cclive.
This tool is very simple. In the terminal just navigate to the directory where you want to store a YouTube Flash video. Then simply type the command followed by the pasted video URL copied from the address bar. In this example, clive pulls Spatry's ArtistiX video
It downloaded for me with no problem. I then navigate to it in the File Manager and play it in VLC.
This tool is not guaranteed to always work with YouTube. I'm not sure if there are oddly formated videos or what, but most of the time this does work for me.