A D in Roman Numerals

I happened to notice a few minutes a go that my next published post -- that is, this post -- would be my 500th. (I have about 20 to 30 posts right now partially drafted or scheduled for the future.) That's not quite 4 posts a day since I started blogging in July. I've received several very encouraging emails and comments, and I'm very appreciative of those. Nonetheless, mistakes remain on the internet, and I've got to get cracking on correcting them.