Created during a recent Music Hackday, this feature (once enabled) sends information about your collection to The Echo Nest so that a personalized station can be created based on those “seeds”. By adding some “adventurousness” the songs added to the station will come from beyond that collection. You can create User Radio stations for yourself, and any of your friends that have also enabled the feature.
Like all stations, you can add and tweak more station parameters to fine tune it as well as “steer” it while it’s playing. Enjoy!