Hmm... I also have Borderlands and I don't play it as often as I should. If anyone else has it, I'd love to try out the co-op.
@fixxxer: I will definitely help you with setting up stuff. I've never put together a steam page/group, nor have I been an admin before, but I'd enjoy the experience.
Cool fact of the day (just because I can): The studio that made Borderlands (and Duke Nukem Forever...) is not far from where I live and will be even closer when I start college in the fall. Might even intern there if I can.