Wow, I stumbled on this thread a bit late! I freaking love the 40k universe and am saddened by the lack of fans here abouts... or maybe where all just not checking these forums as regularly as we should.
I've ran a Dark Heresy (with slight detours into Rogue Trader) for a little over two years but that campaign ended about a year ago. I've been on break from the GM role lately while other members of our group take their turn at the GM helm. Currently we're playing a home-brew system and setting that one of our group came up with and, once complete, will be playing in either a Deadlands game or Dresden Files (she's still making up her mind). Either way, as things are going now, come late summer/early fall, it will probably be my turn back at the controls and I'll be launching a new Dark Heresy game (so there's plenty of time to find this message late!)
However, the game I'm slowly planing won't be focused on the Inquisition but, instead, dealing with the Ecclesiarchy as the big alpha predator/employer(?) of the PC's lives. The last campaign we focused on the intricate plots woven by the power elite with a close look at Radicalism and it's cost and the wars the Inquisition wages against their own in very cloak and dagger stories strewn with moles, double and triple crosses, and a setting where you couldn't trust anyone, much less your own thoughts. In all of that, one thing that I felt was only glossed over or severely lacking was a good hard look at one of the most important aspects of any Imperial's life: faith. So, with a new campaign, I really want questions of faith to come to the forefront and and what better organization to spearhead such an exploration then the Ecclesiarchy.
If your in any way interested in joining in once the game launches in a hand full of months or jumping in on one of the others we are running currently, PM me, post to this thread, email me, or just think really hard about it, what ever twiddles your biscuit and floats your boat
It's just good to know there's more folks interested in 40k around here :-D
Edit: Oh and on the Ultramarine movie, yes, it is one and the same universe as the 40k rpg line (Dark Heresy [investigative horror CoC style], Rogue Trader [high adventure], and Death Watch [action action action]). However, as a representation of the universe, it kind of fails like most anything else that seems to come out for 40k. The universe it self has a LOT more depth intricacy then 3/4ths of the stories released for it would have one believe. If the movie Ultramarine was equated with the any of the 40k rpg's it would be best described as a quickly slapped together one-off test session with pregened characters to test the combat system. The universe is sooooo much more, but I guess the movie is a gateway into it.