Even though he's the bad guy, you must admit he's a fudging genius!

I agree, the only one that could compete with him is Vendetta (though Vendetta wasn't exactly a villain).

The Joker managed to make Superman take over the world.. Yes, he's the greatest villain of all time in my opinion.

There is some translation from real life (one step ahead until the get caught tho)... I remember reading an article that a lot of the high profile mass murderers and serial killers fall in the "bright normal" range. Ted Kaczynski was 167, Ted Bundy was a 136, Jeffery Dahmer was a 145... http://www.examiner.com/article/22-serial-killers-with-high-iqs