Could You Have Aspergers Syndrome?
My score:

Your Aspie score: 153 of 200
Your neurotypical (non-autistic) score: 40 of 200
You are very likely an Aspie

This is the best online quiz to test for possible AS traits that I’ve found (despite one or two odd questions, such as “Do you like watching rodeo-riders?”; that one is experimental apperently and may well be changed soon). It’s been compiled with the help of a number of experts worldwide – including a whole bunch of actual Aspies, via the Wrong Planet forum – and is still being refined.