It ranges from the big 4 all the way to arthouse publishers, big book publishers and the newspaper syndicates. It's a pretty valuable resource if you are submitting stuff or thinking about it to see what hoops you have to jump through to do so.
-M (no I am not considering submitting things, but I know folks who are)
People don't want the Truth. They want only information that supports what they think they already know. -Vess from Invisible Kingdom
I see a comics culture that preserves and appreciates its past, but doesn't wallow in witless nostalgia. -Scott McCloud
Humans beings always do the most intelligent thing…after they’ve tried every stupid alternative and none of them have worked -Buckminster Fuller
Interesting that Dark Horse wants a full creative team onboard with the submission. On the one hand, it's less work for them. Provide some editing, slap the Dark Horse label on it, and send it off to the printers. On the other, I'd think that, with a strong enough premise, they'd want some ability to make it better. There's only so much you can do to improve upon finished pages.
In the world of children's book publishing, where writing and art similarly share equal space, it's an absolute no-no to submit art along with the script. Those publishers consider it extremely important to select the art and artist themselves.
So I find it interesting. I wonder how many solid premises/scripts they reject because the art isn't clicking. Or maybe they just want the luxury of being able to decide whether or not to keep the original artist.