Roweis and I spent an inordinate amount of time on the phone (thank you unlimited calling plans) working through the astrometric tweak code. Despite our initial skepticism, we decided that almost everything works. Recompile and test, let's go alpha!
I also spent quite a bit of time going through one of Masjedi's thesis chapters, in which he shows at very high confidence that luminous red galaxies are not distributed in their dark matter halos according to an NFW-like or Moore-like radial profile, but something with a much
steeper inner profile. This result is at very high significance, and either means that baryons have a lot of influence on the dark matter distribution, or else that galaxies separate dynamically from the dark matter for dissipational reasons. The latter is more likely, but, quantitatively, both effects are interesting.