When I was in high school I became friends with a guy who didn't have a television at home, so he'd come over to watch sporting events. Found out he was rated 1900+ and (i'm pretty sure) was ranked in the top ten for bughouse in the world.
...Yes, bughouse is a lame name - but a great, great chess varient played two on two. You can play it on FICS, although those guys are REALLY f'ing good at it.
My feeling about Knights/Bishops was that Bishops are more valuable while you have both on the board, but that value evens out once you've lost one.