I hate it when good services on the internet go dark and disappear.

There used to be a wonderful tool for exploring music space at http://audiomap.tuneglue.net/ It gathered data from last.fm and Discogs about related artists and presented it in a Java applet spider diagram.

Now it redirects to an EMI Hosting holding page and that sucks.

There's analternative one here http://www.liveplasma.com/ that's not bad but it's not the same.