General video downlding tips here
http://www.gnutellaforums.com/showth...764#post187764
How to get them onto iPod, there's some more tips other than the one birdy left down near the bottom of this page:
How to transfer music to my iPod (& iTunes)
If you're after music video clips, then the sizes will vary between 5 to 80 MB, depending upon length of clip, file format, quality settings. The majority of mine are less than 10 MB. Mpeg 4 clips will import directly into iTunes. So will H.264 format. Other formats you'll need to convert.
If you're using Mac OSX then it's easy to convert. There's lots of freeware programs available.