Or, if you've got Windows, you can get songs off your iPod like this:
1. Plug your iPod into the computer
2. Open Windows Explorer
3. Tools - Folder Options - View - Show hidden files - Ok
4. Your iPod should show up as a drive on your computer. Click on it, and you will be able to click and drag folders onto your computer. They'll probably be in some strange folder structure, but your iTunes can reshuffle all that.