This is a website for downloading/sharing music files found on 'playlist.com'. This version of the site actually works right though. To use it, all you need to do is copy/paste or type a playlist id into the box up top and click 'Go'.
Have a lot of songs that you want, but don't want to download them all at once? If you use iTunes then you can add them all to your library without downloading. Just click 'Download as extm3u' and then go to iTunes and click File->Open and click the .m3u file you downloaded. At first, the songs added to your library will only show the title, though when you play them the rest of the info should be automatically added. Note that there will also be a little symbol next to the titles. This just means that they are online files; so you'll need to be online when you want to listen to them.