This is one of the most excellent I have visited lately. It converts your youtube/google videos to a format that is playable on iPods, iPhones, mobiles etc. It even works, it’s free and it’s online! There’s a desktop version with ads, if you prefer that, and I guess that can be used for converting whatever you have on your harddrive as well.
Watching movies on your cell phone is a pretty nerdy and tedious task, if you ask me, still, I have done it now. And it sort of was ok to watch a movie on the train. I have also found, that there’s a lot of instructional videos to download and look at. Another good feature is to catch up on tv show watching. Right now I am working my way through Family Guy! I bought the DVD and converted with 3gp converter. Works as a charm.