I was a publisher’s rep for about 5 years and ran both conferences and bookstores dedicated to ASD. I’ve only been out of that business a little over a year so most of this should still be current.
I’d highly recommend looking for an ASD conference in your area, especially if Dr Temple Grandin is presenting. She’s a great presenter and a fascinating woman; HBO did a movie about her a few years ago. The conference will have a ton of resources and is a great place to connect with other families.
For a general overview, pick up any of her books, but I’d recommend The Way I See It as an introduction to ASD and SPD.
For social issues, Jed Baker’s Social Skills Picture Book or Carol Gray’s Social Stories. Jed’s books give step-by-step pictorials of how social interaction works, for example, how do you join a group playing a game. Carol’s book consists of stories, many written by students, that explain social conventions and how the world works (for example, what happens when going through airport security).
Dr Tony Attwood is an Asperger’s expert and does a great job explaining emotional interactions for those with ASD. He has a couple of great Asperger’s books, but he is such a dynamic presenter that I’d recommend finding his lecture online. He’s English, has a great sense of humor, and is wonderful onstage. Just look him up on YouTube (for that matter, I think everyone I am going to mention can be found on YouTube). He built a kit of visual organizers that helps explain to those on the spectrum how emotions affect themselves and those around them. It’s popular with school districts and therapists.
Kari Dunn Buron does a great series When My Worries Get Too Big! that deals with ways to lower anxiety. You’ll find this one in lots of schools, too.
For some direct behavior strategies try:
Maria Wheeler Treasure Chest of Behavior Strategies or Beth Aune Behavior Solutions. Behavior Solutions is generally more school oriented, but those strategies transfer into the home.
For SPD, don’t forget Carol Kranowitz and The Out of Sync Child, probably the person who first described SPD in a way that made sense for teachers and parents.
I think most have good previews on Amazon or at the publisher websites so you can narrow down to what best fits.