Progs to convert video/rip audio from vids

[tripostrophe]

I recently found about about downloadhelper, which is a program that lets you download videos from sites like youtube, etc. It allows me to download, and I can play the files since I have VLC, but I'm looking for a program that will allow me to convert the video to a more popular format so I can have another program rip the audio for me. (Or one that does it directly from FLV, or converts video/rips audio would be nice).

Oh, and I'd like it to be free...

So far, I've found one program that'll convert video files called SUPER (Simplified Universal Player Encoder & Renderer), but since I've never heard of it just wanted to know if it's good from a "techie" ish person.

xttp://www.erightsoft.com/SUPER.html

Btw, if you want downloadhelper, its a firefox extension. Or xttp://reviews.cnet.com/4520-11327_7-6555399-1.html