Links
Information and discussion
Swebricks - User group and forum for Lego enthusiasts in Sweden.Eurobricks - Lego forum in english.
Steve's Lego Blog - comments about a lot of old Castle and Pirate sets, not updated in many years.
Buy and sell
Legos web page.Bricklink - a marketplace for Lego sets and pieces and a few other associated categories.
Brickowl - Another, smaller, Lego marketplace.
Lego category at Tradera (swedish online auction site).