I learned about this while in Seattle, but Ephpod is a pretty cool piece of software if you own an iPod. Unlike iTunes, it doesn’t take over your iPod and force it to sync with your computer. It lets you browse the iPod’s songs, and copy songs on/off of it freely. That includes letting you easily plug someone else’s iPod into it and putting songs on that.
The downside, as I realized this week, is that if someone puts a bunch of songs on your iPod with Ephpod, and then you plug your iPod into your home computer which has iTunes on it, iTunes will see all of these “unknown” songs and delete them all. Thanks iTunes!