The Lexicanum is a good reference. I'm one of those odd people that has been collecting 40K from the rogue trader days. As such I have a rather large library of the original rules, I also have all of the current 40K RPG books. Which sadly means that the stuff I know Isn't quite the same as what is on that site. (so much retcon) The lexicanum has helped me to understand some of the changes that has happened to the lore over the years.
If you whant to listen to the lore i recomend this chanel http://www.youtube.com/channel/UCS14rofXz-WT305CKiu719Q
Yes, it seems full of info about everything, but why oh why did they choose this grey background ? Anyone would have a trick to disable it somehow maybe ? Oh that's very nice too, and it's a different way of learning the Lore, different fom books & websites ! By the way I just found my old WH40K tabletop rulebooks from 1993, I'll start reading them again as a basis before jumping to more complex stuff
You mean not accurate about the rules or about the Lore ? Because, well, unfortunately, due a certain thing that's called "real life" I don't have time anymore to play the tabletop game
Well there's also a warhammer 4k wiki that uses the standard white background layout of wikis.http://warhammer40k.wikia.com/wiki/Imperium_of_Man