Watching downloaded movies on the ipod touch?

[Mantronix]

I own a pretty extensive anime collection that I download from various torrent sites. Is there anyway possible that I can convert the movies so I can watch them on an ipod touch? I believe the movies are in a mpeg or avi file. I get bored at work sometimes so being able to watch movies it help the time go by.

[bousozoku]

Since there probably isn't anything legally-obtained, you need not ask for help with this here on MacRumors.