LEGO®
Official LEGO website.

LUGNET (LEGO Users Group Network)
Unites LEGO fans worldwide through discussion groups, web pages, and services.

BrickLink
The Unofficial Online LEGO Shopping Mall.
Attack of the Bricks - Jon Palmer
MWD LEGO Bytes - Michael Daniel

BrickShelf
View old LEGO building instructions and catalogs. Share pictures of your own creations.