C.C.
Each time Apple updates the iPod, it becomes a new "generation" of iPod. So the higher the number, the newer it is. Since iPods take pictures, videos, and you can store movies on them, as well as music, it may be worth it to get more GB. My daughters each have an iPod touch that their grandpa bought them for Christmas, and they use those things ALL THE TIME. They play games, they listen to music, we have a bunch of movies that we've downloaded to their iPods (most DVD's or Blu-Rays now come with a copy you can upload into your computer, then download to an iPod - this is great if you take road trips! Keeps the kids happy for HOURS! ;) When they opened their gifts at Christmas, I thought to myself, what in the world will the girls do with these things? Well, now I know! These things might as well be permanently attached to their hands!