After a lot of hardwork and research, Grooveshark, the company I work for has released the next iteration of Grooveshark Lite, our web-based music discovery service. The newest release of the service supports an Autoplay feature, which generates recommendations based upon your listening habits. At the simplest level, you can just drop a few songs in your queue, click Autoplay, and the system will provide a continuous stream of songs based on feedback you provide.
The system uses a combination of statistically generated relational data and expert driven recommendations to provide what we hope is a very enjoyable play experience. Of course, this is a beta, so forgive me if it's not always 100% to your liking. Myself and a few other employees have had a large role in the design of this system, and I have to say that it's been one of the more interesting and challenging projects I've worked on.
Grooveshark Lite, Featuring Autoplay
Download Squad Review
Some Interesting Artists I've found using Autoplay:
The Bird & The Bee