Here's a question: My iPod seems to make "duplicates" of all mp3 files when I sync, why? This happens when, for example, I've changed some ID3-tags on, let's say 200 files. When I connect the iPod to the Mac, it says updating songs, but the status bar in the bottom of iTunes keeps growing bigger, even though they aren't new songs, but old ones that were on the iPod before, the only thing I've changed are the ID3 tags.
For example, right now iTunes and Finder both say that the iPod has 1 Gb or so free space, meaning that I've filled up 17 Gb of my 3rd Generation iPod's 18 Gb. Funny, since my Music folder is only 13 Gb and I don't have any other files on the iPod other than my music, and maybe a couple of hundred K's worth of contacts and notes.
Shed some light, oh powerful Mac friends!