It does just what it says.
"Here is an example of DOT-POD in action: Let's say you've created some original music in GarageBand and you want to make it available to your clients, or friends and family. You can't really email huge files to all your friends - the easy way is to copy them to your iPod and use DOT-POD to make them available on the web from your iPod so that your, clients, friends and family can download them from their web browser. "
Freeware, Mac OSX only ;-)
Check all others DOT-software, like DOT-PHOTOS, which does the same for iPhoto!