I'm sure someone has mentioned this at some point in this thread, but DownloadHelper supports every flash video site I've ever visited, and has quite literally never failed me.
Much more straightforward than the /tmp file technique.
J. Ky Marsh's Youtube - HD-quality linux tutorials for those of us who don't speak in binary!
the easiest way to download youtube videos is with the firefox addon "unplug". you can score a lot of free pr0n with it, too.
It makes you think, These people who make software for this sort of thing, Why did they not think of this?
And i mean, I'd rather this than a download link, That way you can stream it too and it does not take any more of your bandwidth.