We have boy/girl twins both diagnosed with severe autism who are turning 5 this week.
My wife blog on the subject at http://www.networkedblogs.com/blog/my_familys_experience_with_autism and admins a Facebook group called "We Care About Someone With Autism".
Hey I just visited your blog. Props to you guys for braving the Santa experience!!! Our 6 yr old is only mildly on the spectrum, yet has always been terrified of Santa, WDW characters, etc. Her teacher gave us a social story about how she could just walk by and wave, instead of interacting with them.
I agree 100% with you guys about trying to push their comfort level. We just haven't gotten there yet with big people in suits!! Our older dd is 13, so it's been a long time since she visited Santa. Anyway, thanks for sharing the blog!!