Well, I missed yesterday, so I'm going to have to make up some lost ground...
Anyway, I was pleasantly surprised on my last visit to the Bolter & Chainsword forum that the website creative team had written a background book of their very own:
The Dornian Heresy
This downloadable supplement turns the central events of the Warhammer 40K universe upside down. In simplest terms, it recasts the good guys as bad guys, and vice versa.
This makes for some interesting alternative fictional history, and opens up some very interesting modeling opportunities.
I know not everyone is interested in this, but... so what? I'll try to post some items of more general interest real soon. Like I said, I have some lost time to make up.