A while back, I had a post about Pandora, a cool new music streaming service that lets you create your own radio station, tailored to the kind of music you like to listen to.
If you still haven't tried out Pandora, here's an article from Fast Company that might get you interested. It introduces us to the guys behind the Music Genome Project and some insight into why Pandor is much more than just another music matching service.
I'm still using Pandora regularly, especially at work, where the fact it runs in Flash means it doesn't get blocked by our vigilant web-blocking software. This article gives you some extra details on how to work with the software to make it even more powerful and help it to introduce you to a whole lot of music you would never have found otherwise.