I've never played the tabletop (although I do own a few painted miniatures), but I'm a very big fan of W40k. I mostly got into this universe via the novels of the Black Library, of which I have over 60 by now, and the collection is growing. Call them unimaginative all you want, but I love Space Marines and the like... my most recent purchase is a monster of a book called the Liber Chaotica, so as you can see I'm really into the whole background lore.
Oh yeah, and the DoW games (well, all except Soulstorm, of course) are among my favorites. I'm one of the folks who liked DoW2, and I'm really stoked for Chaos Rising! (Probably won't get to play it until April, though -.-)