For those that still don't know. Work practically every time. http://www.videocodezone.com/conversion.php
Yep I also use such a program, and I also have a program that I can immediately download them as a file which I can play on my PSP.
http://www.mediaconverter.org/ also one you can download a movie from youtube to g2p ( or whatever its called ) .. to save on your mobile phone
take your pick of built in firefox extensions https://addons.mozilla.org/en-US/firefox/se...ube&cat=all
You can also do it manually by copy and pasting the FLV file from your temporary internet files. The name of the file is usually gibberish, but theres ways to find out which file you want.