What happened yesterday is that I didn't check the front page like I usually do. Instead I went in and updated other sites like Dragon Princess and Shadey Theatre by copy/pasting the code from my HTML editor instead of going to the Panel Monkey site and getting it there.
This is pretty much what everybody saw all day. I found out about it when a friend of mine told me the site was screwed up. I checked it out and sure enough it was. I fired up the HTML editor and tried to find out what was going on. It did tell me at the end of the page with a highlighted </body> tag that a <div> tag wasn't properly closed. That's no help. Which one is it? There are hundreds of divs on that page. On top of that everything looks normal in the Design View of the editor.
I finally traced it to the recent updates line. I noticed what looked like some extra divs in that box. I found the code and deleted them and everything fell into place.