Top: Kids and Teens: Sports and Hobbies: Toys: Lego: User Groups (3)
http://www.simiax.com//Kids_and_Teens/Sports_and_Hobbies/Toys/Lego/User_Groups/index.htm

LUGNET - The international fan-created Lego Users Group Network -- where Lego enthusiasts of all ages find information, meet one another, and share ideas.

BayLUG - A loosely organized Lego users group based in San Francisco.

Kidlug - An online Lego user group for kids ages 10-17 living in the US or Canada. Provides a newsletter, registration and membership information, FAQ, poll, and a message board.