Rocketsurgeon directory of internet music stuff: describes Playdar this way
Playdar is a music content resolver service – run it on every computer you use, and you’ll be able to listen to all the songs you would otherwise be able to find manually by searching though all your computers, hard disks, online services, and more.
What’s valuable about that post is that the writer described the value in his own words, not just copying and pasting, and in doing that helped to define what the value proposition of a content resolver is.