The One Page 40K Rules have been updated to include lists for various Space Marine chapters.
Warhammer 40K
Activation Roll, Action Point Alternate Skirmish Rules For Warhammer 40K
Gemini is a set of alternate skirmish rules for Warhammer 40K that use an Activation Roll, Action Point system.
There seem to be quite a few people who love the Warhammer 40K Universe, but who are less than enamored with the rules.
Warhammer 40K Tower
For DIY 40K players, here’s a template for a gothic looking tower. Print it out and cut from foam core.
Free Warhammer 40K Building Paper Model
For Warhammer 40K fans, here’s a paper model of a multi story building designed for the game.