From John Mauldin's investment newsletter. I thought this rang true (link added):

"One participant [at the 7-day Singularity University event] suggested that in the future, as we get closer to true AI, computers should be tasked with designing the next generation of AI and computers. I pointed at that if we were to do so, then the Turing Test might not be the best way to determine if we had true artificial intelligence rather than just extremely sophisticated programs. I proposed the Mauldin Test. When a computer tells us that it no longer wishes to program a smarter computer, we will have arrived at the point of self-awareness and survival instinct. I suggest that is true AI. Just a thought."

UPDATE: Winds reader "Piercello" has been thinking along similar lines, into a full-blown theory that links intelligence to emotion.