Nice, but having such rigidly defined genres means you're going to miss out on the best of electronic music today, which is increasingly abandoning the genre classifications which have straightjacketed the music in the past.

For example, where on earth does this fit?

http://soundcloud.com/bleeky/r-s-d

or this?

http://soundcloud.com/raffertie/ergo-we-are-human-1

Sure, you can shoehorn them into house or techno, but that doesn't really do it justice. And having a 'misc' genre like 'electronica' is cheating. Electronica is a word invented and used by music journalists as a substitute for a proper understanding of the culture. And don't even think about including IDM or you will lose all credibility ;)

Otherwise, great work!