Playdar really is rather interesting. Described as a “music resolver” it allows you to search for music across linked resolvers. A resolver can run on your laptop, your desktop, your server-in-the-cupboard, a mobile phone, and then, more interestingly, websites on the net. Any website can implement a Playdar resolver and become a provider of music to your search. The code comes from the man who invented audioscrobbler for Last.fm. Playlick is a good demonstration of it all. It queries my Last.fm account for all the music I’ve listened too over the years. You then run resolvers, or connect to resolvers, which provide the actual music to my Last.fm list.