Quite an improvement over yesterday! Dry, crisp, but with a howling crosswind that was neither helping nor hurting. Just a few more degrees to my back and I could have thrown up the spinnaker and coasted to work.
New outer ring. New chain. New cassette. It's all shiney and clean. Shifts smoothly. Runs quietly. Doesn't skip under load in the littler cogs. I should have done this weeks ago. Oh well. I'm going to get a chain wear tool and maybe use Sheldon's cleaning and lubing system now that I have a powerlink.
Oh, new rear wheel too.

Apparently my Race Disk was developing flat spots. I got a Rhyno Lite to replace it. Seems to get mixed reviews, but the people who don't like it talk as though they're abusing them, so whatever.