For all of the talk about how you can't share iPod music, I've discovered it's quite easy to copy files from an iPod to a PC (also a good way to back up your music or transfer it if you're getting a bigger iPod, as I am) without downloading some sketchy shareware program... here's how:
1) Open Control Panel, go to Folder Options, click on the View tab, and highlight Show Hidden Files & Folders.
2) Connect iPod to computer.
3) Open My Computer and click on the iPod drive (as if you're opening a floppy disk).
4) There should be a faded folder that says iPod_Control. Open that.
5) There should be a faded folder that says Music. Open that and there should be lots of folders named P00, P01, P02, etc. They have your mp3s in them (sorted in a system I have yet to figure out).
6) Drag whatever files you want onto your hard-drive.
It's that simple. Have fun!