So several posts in the July '04 archives had div tags with their blockquote tags, for some reason, & so they were wrapping up to the top of the page & overlaying earlier posts. All v. bizarre. Only 3 posts & only that month. How was I handling blockquotes in July '04, & why would those 3 posts & that one archive page be the only ones affected? Fixed, anyway.
While we're making template confessions, it also seems that in an earlier version of Firefox my subtitle / slogan shows white on white, which sort of makes it hard to read!! Will try to fix it.