Jon Skeet - I wish my brain worked like his. He really is my hero if for no other reason than his passion and dedication to everything he does. Seriously! and Not so seriously
Scott Hanselman - Oh how I love Hanselminutes!
If I am being honest with myself, (though it will cause many groans), Bill Gates. The man is a genius. He was writing software back when the word "developer" meant someone who developed photographs.
While I wouldn't classify him as only a developer, Steve Wozniak is another one of my personal heroes.
Currently my personal developer super hero is the guy who is bringing an old feature back to Corepoint that I used all the freaking time! Unfortunately, he is as yet unnamed.