CHADD (chadd.org) is a good website to go to for support for ADD/ADHD. They have local chapter meetings and area conferences too.
OASIS(aspergersyndrome.org) is a very valuble site for Aspergers Information, Support and Conferences, it is full of resources!!
New Horizons puts on conferences all over the U.S. with renown speakers and are very reasonable $ for Autism/Aspergers