"None So Blind" by Joe Haldeman

I don't want to get too into the specifics of this amazing little short story. It's best if you read it yourself, I think. Suffice to say it posits an interesting question of what people will do for intelligence; what they will be willing to sacrifice. It also involves some really interesting descriptions of how computers and human brains work, and, most importantly, how they differ. The end result is a disturbing but compelling story that I can't recommend enough. I'm definitely going to have to look up some more of Joe Haldeman's work myself.