KillTheToy I've got pretty good knowlage of the fluff for Chaos and the Imperium. I'll probably focus on Chaos, though.
Heatedpete - I'm an editor on the Warhammer 40,000 wiki, as well as here, so if there is any need to help with some of the transwikied articles after they've been copied, I'll be happy to help. Over here, I'll mainly concentrate on the Space Marines and Chaos areas of the articles, as that's my hobby base.
Eralam - I would like to help make more dedicated, specific and truly comprehensive articles on the background of the game and descriptions of vehicles and biographies of special characters and such like! Please message me to help with Vehicles of the Imperium article creation! I am very knowledgeable about the history of the Imperium and the other factions, as well as their social atmospheres and actual in game tactics if that counts for anything (which I suspect will not)