A huge achievement occurred last week...... the 40k Wiki hit its 5,000th article. Thats amazing since every single article has been updated since it was taken over by Montonius in 2010. I find it the best resource out there for background and research in the 40k universe.
Also don't forget that the 40k wiki is the only wiki for our hobby that I personally advocate. The guys here are helpful, resourceful, and dedicated to our hobby. With excellent editors and a vision, the 40k wiki is the most accurate and helpful resource out there.
A huge congrats to the team there.
Check out the blog entry here