I sent an e-mail with the exact text of my post to Greg - everyone else checks the boards, so all is well, I think.
I can start up a gmail thread if that's a preferable situation, I suppose - but without the flurry of activity that normally accompanied KoA, it also may be possible to entice Greg back to the boards.
As for the specifics, I probably couldn't start running a long-term game (at least not a well-prepared one) tomorrow, but as I mentioned above, I don't want to abandon the mantle of GM entirely. Until I have something that 1) Seems like it has a green light from the group and 2) I've got at least a solid campaign framework for, then anybody can run something.
Both you and Liz have already volunteered to run some stuff in the interim, and I don't see any reason that both of you can't go ahead and do so.