What's the diff?

Somebody explain this to me. There are all these different styles of club music out there, and for the life of me I can't grasp the subtleties among them. Can someone clearly articulate the differences?

chill

downtempo

lounge

ambient

trance

house

progressive house

drum and bass

big beat

breakbeat/breaks

groove

techno

electro

Well, I guess I can tell ambient from drum & bass, chill from house. But some of the others seem like slicing the genre a bit thin, like they used to do to jazz.

Personally, give me something at 156 bpm that stirs my blood, and... I can run to it.  :)  Like today!