Gus the Fuss has linked to a piece on Age Of Autism which is "covering" a new study which again suggests that there isn't any evidence that thimerosal causes autism. The AoA piece is here: www.ageofautism.com/2009/01/feeding-the-hungry-lie-italian-style.html, but you can read a quick précis here if you like:
"A new study has shown that thimerosal doesn't cause autism. *insert fingers in ears* LA LA LA LA!!! WE'RE NOT LISTENING!! WE KNOW WE'RE RIGHT!! LA LA LA!!!"
The original piece, in "Pediatrics", is here.
Edit: I've just come across Orac's excellent explanation of this research and the stupidity of the anti-vax crowd.