Thanks Road Fan. I really like them. They're screwing up my riding though: I'm avoiding all my favorite fire roads because I don't want to get them dirty.
Unterhausen, those are V/O rims. The rear one actually needs to be replaced (the truly horrific V/O "Squeal free" brake pads dished out the braking surface in less than a thousand miles) but can't decide whether to use another V/O rim (works great, looks fine, reasonably cheap, really heavy) or the Pacenti rims (look fine, pretty expensive, maybe too light).