LUGNET - Global community of LEGO enthusiasts, LUGNET™ unites LEGO fans worldwide through discussion groups, web pages, and services. As an independent site by fans, for fans, it is neither owned nor operated by the LEGO Company.
LEGO Links of Linda Hamilton - great collection of LEGO sites including lesson plan ideas.
Brickset - is the web's best guide to LEGO sets old and new. Search our database, keep track of your collection, read reviews written by other visitors and use our quick links to LEGOShop, eBay and Amazon to easily find sets you want to buy.
BrickLink - is a premium venue for individuals and businesses from all around the world to buy and sell new, used and vintage LEGO® through fixed price and auction services.