Whats the best type of files for movies on a ipod touch?

Whats the best type of files for movies on a ipod touch? Thanks for the help, I wanna put as many movies on it I can, I have a 8GB ipod touch.
Answer #1
Convert any movie to .mp4 with total video converter
Answer #2
And how much space is a .mp4 on a ipod touch?
Answer #3
And how much space is a .mp4 on a ipod touch?
It all depends on the video duration and the video quality profile(bits/sec) you use to convert it into an mp4.
Allok 3GP PSP MP4 iPod Video Converter has got inbuilt profiles for the device.