goes the other way too, playing techno in an electro or house set is really fun.
I was at a drum and bass show a few months ago (really cool, in an old abandoned church) and everything we heard from the speakers was a boom-a-tshak-a-bomboom-tshak until one guy decided to drop a schranz track at about 160 bpm. Got the entire place on the dancefloor.
I honestly think DJ should stop playing genres so much as playing moods. Doing stuff like that is fun because you get a cohesive set (because its all the same mood) but you get a lot of variation (because of the different genres) which leads to fun mixing.
I did a mix like that a little while ago, but its got a bunch of rock in it too. Here's a link - http://www.djnew.com/mp3/new-stalker_mix.mp3