Those running, or thinking of running, a home-run ABA programs, a useful resource is Help Us Learn, a "complete self-paced training program for preparing parents, educators, students, teachers, therapists, service providers, friends & family" - visit http://www.helpuslearn.com/index.htm for details.
Check out http://www.abaresources.com/ is a resource site run by a Toronto area parent, providing free downloads, a materials exchange, "help wanted/available" postings and other useful items.
Particular of interest in the time before a formal diagnosis is a new online autism glossary (http://www.autismspeaks.org/video/glossary.php) that provides a visual demonstation of some of the “red flags” for autism.
The web site www.nlconcepts.com is a commercial site, but supports their materials-for-sale with some interesting and thought-provoking articles about autism in daily life.