This…is…awesome. One dude, who is really good at Flash and clearly a huge metalhead decided to really explain all the sub-genres of metal. It's incredibly thorough, linking similar genres and even providing a few tunes for each sub-genre to give you a good idea of what the genre is all about. This map really shows you just how huge metal is. I guarantee you will waste a good amount of time on this site. So I'll stop writing, and you can start browsing. [ via Shreddit ]