Pete's Top Choices:

Mid-Penisula Muscle Car Club: This is what all clubs should be like... great people, totally welcoming without any attitude at all, and doesn't cost a dime (it is supported entirely by voluntary contributions of both time and money). The founder and president, Stu, is an incredible individual defined not only by his love of cars, but by his unparalleled kindness, humor, and hospitality. Stu has welcomed countless car enthusiasts into his home (and you should see the setup he has in his garage!!!) and treated each one like they were an old friend, even if it was the first time they met him in person.

Mopar Mailing List: This is one of the most popular car-oriented mailing lists out there, and certainly one of the best. I've learned a TON on this mailing list. The website is currently down, but the list is still very active.

Moparts: A huge bulletin board dedicated to Mopars. Tons of tech information here, and a great source of parts and bench racing.