TuneGlue is yet another site that shows related artists (like recently mentioned Music Map). Once you search for an artist, you have to click on it and choose Expand. The site is powered by data from Amazon and Last.fm. Rick will be pleased to know it even has Dennis De Young :)
I had to check to make sure you didn’t photoshop it. :-)
As the old Ragu commercial used to say, “It’s in there!”
Since you are lately linking association sites, here is another one I found interesting.
http://www.bandtoband.com/
Cool – thanks for the link!