Two recent links of interest that probably won't be available indefinitely:
"The Addams Family Super Mega Post!," found on Dartman's World of Wonder Blog-
A great introductory post for aspiring Addam’s Family trivia-ists, this link is a collection of info, music downloads (Classic show soundtrack, “The Lurch” sung by Ted Cassidy, and the 1977 “Halloween with the New Addams Family” OST), and videos of the Addams Family’s appearances in The New Scooby Doo Movies!
Also, “Happy Halloween from Chas Addams” originally posted on the Hairy Green Eyeball Blog-
This post has a number of original Charles Addams comics from Addams’s first comic compilation. It’s a great introduction for people who are fans of the shows or movies but haven’t had a chance to see what started out the franchise.
Enjoy these links while they last, as it's possible that their full content may not be available indefinitely.