I took another look around and found this article from Autismspeaks.org that shows a review 10 studies representing 1.2 million cases of autism and analyzes the effect of vaccines. This article goes so far as to state that if anything, the MMR vaccine is PROTECTIVE AGAINST AUTISM. I would question the protectiveness but wonder whether the data speak more to the genetics of the parents in terms of their ability to make a decision whether or not to vaccinate (i.e. parents on the autism spectrum might be less likely to vaccinate and more likely to have children with autism), but that is a separate issue.
