Some of you noticed that there was a huge outage of sorts at many of the sites I own or work on. Thank you for contacting me about that.
The servers that host all of these sites were upgraded early this morning to the latest stable build of mySQL and php. As it turns out, the WordPress plugin for Markdown that was being used on these sits did not work with the newer version of PHP.
A new version of the plugin has been uploaded to all affected sites and everything should be back to normal.