Follow this link to try the Autism Quotient test. After taking it, I'm ready to believe that autism is just a special case of being a guy. The average score is 16.5, and 80% of those diagnosed with autism scored 32 or more. Your score appears to depend mainly on (1) your comfort in social situations and (2) your feelings about numbers, categories and patterns.
Personally, I find license plates fascinating and parties terrifying - and my score was 30. My wife is the opposite, and hers was 6. I'll bet this chasm is typical. Not only is it men who hail from Mars, but it's also men who build model airplanes, become mathematicians, write software, play the Blackberry... So it should not be surprising that 10 times as many males as females are diagnosed as autistic.