I thought I had accidentally blocked myself from posting on my very own site, mainly because I had recently done some wmapping of a corporate site (hi, Phaedra!) and thought I got my IP on a blacklist because of it. The Bad-Behavior plugin I use on this WordPress installation does a great job at blocking spammers, but was also blocking me! I added my IP to the whitelist and promptly forgot until this morning when Substitute pointed to a new release of Bad-Behavior. I guess one of the sites BB checks was returning a constant false-positive, so *everyone* running it was getting locked out of posting. I just upgraded and removed myself from the whitelist, so assuming this posts correctly, then all has been fixed.
So if anyone was unable to comment in the last few days because Netninja thought you were a spammer, that’s why.