Reporting in late here: they got the site back up again. I must say they did it lickety-split; that's good service! It was that darn load on the database that did it. I wonder if it's all the people trying to register at Tim's site. Oh well.
I paid for and downloaded Expression Engine (the Pmachine Pro upgrade), so I'll install that sometime this weekend and see if it will work more efficiently. If worse comes to worse, I could take away the registration link and force wannabe commenters to email me directly, and then I'll register them myself.