I have compiled a list of links to clubs, resources and other cool stuff Lego…

NXT and Mindstorms Related Blogs
NXTasy.org .. a Lego Mindstorms NXT Community
The NXT Step The NXT STEP Blog brings together news and information related to the LEGO Mindstorms NXT system.
BNXT

Lego Community / Market / MOCs
LUGNET, the worlds largest online Lego community.  If you want info on Lego, go there.
RTL Toronto. The local Robotics / Train club in the Greater Toronto Area. A lot of cool things happen there…
BrickShelf Lego Maniacs from all over upload their MOCs here.
A central portal to begin to discover everything related to lego. Great for those who are just starting out and are looking for links…
Bricklink Looking for those hard-to-find Lego pieces?
Lego Mindstorms The official Lego Mindstorms website.
Lego The official Lego website.

Rendering / Instructions / CAD
LDRAW A collection of tools to create, edit, render and publish Lego parts and creations.

Programming / Sensors / Other
Pete has put together some very interesting and useful sensors here. You can buy directly from him.
MINDSENSORS A variety of NXT and RCX custom sensors such as multiplexers, sensors and actuators which are LEGO RCX, Mindstorms NXT, and I2C compatible.
NQC (Not Quite C) is a C-based programming language that is powerful and easy to learn. NQC is a DOS-based compiler. You write your code, then compile it using NQC or NQC with a 4GL program such as BricXCC (RCXCC).
BricXCC / RCXCC A great Windows-based development environment for programming the RCX.
RobotC A great Windows-based development environment for programming the NXT using a C-like language.

Cool Technic / Robot Creations
Jennifer Clark Some of the coolest scale models of construction equipment I have seen. Excellent work and detail.
J.P. Brown Excellent – just check out the CubeSolver….
Jin Sato A nice gathering of cool robots.
Joe Negata A neat list of Lego robots.
Demmos Bosman Nice scale models of various trucks.

Other
Lego Lingo Every business / sector / whatever has its acronyms. Well, so does Lego. Check it out.