At my gym we do 3 sets of ten strange push ups. I dontknow the name but they are used in some MMA gyms. You kind of drag your body close to the floor. It looks like you are trying to glide and have sex with the floor at the same tme!! Sorry for the crap description. I think Frank Shamrock uses them and they might be on the net.
I think they might be called Egytian or Hindu push ups. They work a treat.