Very Interesting Program

[Summerlander]

It's called Tooble, it converts .flv files to .mp4 files, and can download them to your iPod. (That means that movies from YouTube go on iTunes, for you "special" people.)

Tooble - Internet video by your rules.

 

[fantanoice]

Not worth it. VDownloader converts to MP3, PSP format, .mov, .avi, MP4 and a number of other formats.
http://www.vdownloader.es/

Or if you don't want to download a program, you can use Zamzar, a browser converter which does the same:
http://www.zamzar.com