ADHD in the Autism spectrum? | ADHD Information

I've heard some theories that ADHD/ADD may be related to the Autism spectrum disorders. There's a lot of common or similar symptoms in both, and comorbidity with both deseases are not uncommon. What do you think?

At least I feel that I understand the autistic mind somewhat better than so called "normal" people. I for instance agree with them that "normal" people are hard to understand, I especially find smalltalk un-interesting and hard to understand....
I HEAR IF YOU GET A ADD OR ADHD DX THEN YPU NEED TO RULE OUT ASD. ASD PEOPLE HAVE ATTENTION ISSUES ALSO.