I offer for your consideration the alpha and the omega of medical blogs on this topic: the always excellent Science-Based Medicine, which gives all the details one would ever want to know on the topic, and the differently-excellent Crap-Based Medicine, which cuts right to the chase:
Q: Do vaccines cause autism?
A: No. Total crap. And while we’re at it, here are five more things that don’t cause autism:
It's hard to improve on this masterly summary, but I will add one more item to the list: