Sweet!! Spotify player using RFID magnets in physical to store Spotify URLs that the "radio" can then play... is Jordi Parra’s degree project.
Blog : http://blog.zenona.com/
Geek stuff: http://www.creativeapplications.net/processing/spotify-player-processing-obje...
Perfect example of humanising tech.
Also a perfect moment to mention IDEO's similar (and similarly awesome) project c60 Redux - which does a very similar thing but using specific tags for music files rather than playlists.
[vimeo http://www.vimeo.com/16064308 w=500&h=283]