Tux says thank-you for all the sympathy. He was properly pathetic all day, and insisted on spending most of it in my lap.
But that meany I had plenty of time to knit. And as a result...
I've done lots of top down sweaters, but all have been raglans or round yokes, so I was really curious how this one was going to work. Once you get the hang of it, it's really easy. Stitches are picked up around the whole arm hole, then you work to just past the top centre, and start short rows, working back and forth until the sleeve cap it complete. Pretty genius. I've already got plans of my own for a design using this method.
But first, I have to get this one off the needles, of course.