LUGNET - International LEGO User's Group Network

Brickset.com - Online Collector's Resource

Let's Build it Again (Instruction Manual Scans)

Peeron Instruction and Catalog Scans

BrickShelf.com

BrickLink.com - The Unofficial LEGO Marketplace

AuctionBrick.com

Adequate.Com LEGO Maniac's Guide

In addition to LEGO, I also collect die-cast scale models.
Here are some of my favorite sites:

AesseModels.it
Unofficial Gran Toros Web Site
Unofficial SPOT-ON Collectors page
Auto Jaune Paris

If you'd like to link to this web site, please use the following URL:
http://legoweb.com