PlaylistNation is the free, legal, and private way to view which songs your friends and family are listening to on their PCs. The PlaylistNation client works with all popular audio player programs and will post the track names of the song files you play to your private online account.
From your online 'My Music' page, you can review which songs your friends have listened to recently and leave comments about any song. You can even post a list of your most recent tracks onto your personal homepage or blog.
It's a great way to learn about new music from the people you know and trust. It works with . mp3, . ogg, . wma, and . aac (I-Tunes) and all major music players (WinAmp, Windows Media Player, ITunes, etc.