I just got one of these yesterday and I'm already addicted to it. What it does is it keeps track of all of the songs that you listen to on your iTunes/limewire/WMP/iPod/computer/etc and it shows you like different charts for all of your songs. For example it keeps track of your most played artists and most played songs each week. And then it also keeps track of your overall most played artists and songs. It's great for nerd like me who like to figure out different stats for your songs. Anyways if you're addicted to iTunes or anything like that then I definitely recommend this because I'm already obsessed with it! And it's also really easy to figure out.
Oh and here's my profile for it... beware, I know that occasionally I do listen to strange songs.
Anyways if you're addicted to iTunes or anything like that then I definitely recommend this because I'm already obsessed with it! 
And it's also really easy to figure out.
