A commenter on my CSS Help Needed post said that in IE6 the blog looks fine. I sprinted across the room to look at the blog on John's PC. He uses IE8. And sure enough, the blog looked fine. I remembered then that I had increased the point size on my Macintosh browsers because they were hard to read on the small laptop screen. The way blogs are designed, they use the room as coded from left to right on the window. If the blog runs out of room, the last column on the right gets weird. And that is, apparently, what has happened. Yes, I am embarrassed to have publicly displayed my disorganized memory.
My only concern now is that I don't think, but can't remember, that I ever changed the point size on Camino and it is behaving exactly as Flock and Safari behave (big gutter, center justified text). I need to find those sites that show you how your blog looks on different platforms and browsers. Now — where are those links . . . . .