I was going to make a thread about this the other day because i had no idea how to convert them, but i figured it out. Inorder for videos to be put onto iPods, they must be converted into MP-4 format. Videora is an easy to use program...
http://www.videora.com/en-us/Converter/iPod/
HOW TO USE VIDEORA:
1. Open it up and install it
2. Get on the convert page
3. You will see the "One Click Transcode" button click this
4. Browse the file and select it
5. Let it convert
When it was done and i went to add them to iTunes, i had no idea where they went. If you want to make them go into a certian file when they are done, or to figure out where they go after they are converted, go into the settings (the second tab on the left) i cant remember what its called, i dont have the program on the computer im on, and it will say something like 'Video Output" and that is where your videos will be sent to.