Here you can find some of the most useful links in the LEGO world.
Combine the Lego sets you have and find out what else you can build! This cool website will help you figure out what you are missing.
Unofficial LEGO Market place. Any LEGO bricks you are looking for ... here you can find it.
This is the website of Nathanaël Kuipers. Definitely one of the most creative builder out there!
Here you can find the most recent buidling instructions available for download.