theres probably a tonnnn of ways to convert them.. but i downloaded this free 3gp video converter which i've been using a ton and works well and fairly quick. you can download it here:
this would interest me a fuckload more if my 32GB iTouch hadn't been stolen.
Now i have an 8gb nano, filled to the brim with music. going through these movies makes me depressed.
but here's another option for you guys: http://torrentz.com/search?q=ipod+movie
make sure to have a bittorrent client downloaded. i suggest uTorrent.