Get a Zalman bracket - comes with a pretty quiet 90mm fan and maybe one of their FanMate controllers too. You can aim it pretty much where you want. Sunbeam also has a bracket kit that can be used to mount fans or even an extra HDD, but it's just the bracket, no fan, etc..
.bh.
PS: Oh man, I just hit 13k(dec.) posts! - wasn't even aware I was sneakin' up on it...