YouTube has created what they're calling "YouTube Disco" as a project to find music videos that are similar to the artist you search for. Think of Pandora or Grooveshark, only with music videos. Also, take away attractive site design, approval options, bookmarking, sharing, and commenting.
It really is a shame that YouTube decided to do this only half way. Having a "music video genome" project would be truly unique, useful, and entertaining, but this setup seems more like a work in progress. Maybe it is, and this will evolve into something awesome. Knowing YouTube, though, I kind of doubt it.
The search results I got were poorly organized, if you can say that they were organized at all. It's like a big jumble of text stretching all the way down the page. There's also a gigantic description of whatever band you searched for near the bottom, but it's not formatted or anything. Just a huge blob of text. Take away virtually every other feature that makes YouTube worth using, and you're starting to get the idea.
One thing I will say for the Disco project is that it very easily picked out songs and music that were very similar. In some cases, I felt like they were a better match than Pandora suggestions, but it's all relative. This really is a great concept, just a very poor execution. Give it a quick once over, and let us know what you thought in the comments.