On the down side, I've got two big problems. First of all, my lecture would be on Shabbat, and that could get uncomfortable with the whole not-using-electricity thing. Second, they don't have funding to fly me out to Stockholm; I'd have to apply for my own funding, and I'm not even quite sure where to start looking for something like this. Not currently being affiliated with NYU is a problem, though if I accept the Columbia offer I imagine they'd be willing to send me.
I'm going to interview the Columbia people on Thursday; now I've got double incentive!