We upgraded the WordPress software that runs the blog to the new 2.3.1 version, in response to vulnerabilities present in the old version. There was some downtime this afternoon (intermittent over ~10 minutes) as I switched our installation over to manual (as opposed to Debian package-managed) and then upgraded to the latest version. In the process, I set up a system so that hopefully future upgrades will happen immediately after release of a new stable version, and should cause zero downtime.