This sounds great, indeed. With a listening history on last.fm that reaches back to early 2009, I always thought it would be great to have a service to use the last.fm data to build dynamic playlists for spotify.
Populate a http://developer.echonest.com/docs/v4/tasteprofile.html with the listening history and you can use it for dynamic playlisting using the spotify catalog. That is as long as echonest matches the song metadata to an id.
adamcik|11 years ago
http://static.echonest.com/enspex/web/ChillRadio/ linked from the demos shows this for artists as a seed, but tasteprofiles as the station seed works nicely as well :-)
m_gloeckl|11 years ago