I had my interview today, and I felt really good about it! It didn't feel like a courtesy interview at all; I think they're treating me as a serious candidate. In fact, it felt much more like a thoughtful conversation than an interview at all. I didn't have any interview nerves, and I had thoughtful things to say. I feel good about the whole thing.
(Naturally I've second-guessed a couple of things I did or didn't say, but that's pretty much inevitable, given the person I am. And that second-guessing didn't start until 5 or so hours after the interview, which I think is a good sign.)
I was the last of three internal candidates they've interviewed, and they're bringing two external candidates to campus. I have no idea who the other internal candidates are, and while a part of me would love to know who they are, I also know that I'm better off not knowing.
The hiring committee will be interviewing the external folks in the next couple of weeks, and they'll announce their decision by the end of February. So it's all over but the waiting.
The really good thing is that I had a great teaching day as well -- a combination of fun material and eager students. This is a good reminder that I'm in the incredibly fortunate position that my "fall-back" option is keeping my fabulous teaching job that I love. So all is good. And I can hold my head up no matter what happens.