Well, I just plopped in a new theme. The old one was pissing me off way too much. I’ve actually had similar problems with several themes… something in a plugin or post will inject some CSS garbage that will throw the whole thing out of whack. I’ve been able to iron out the most of the bugs, but one that I couldn’t figure out is that some posts will cause the sidebar to show up at the bottom of the page. This post is a good example. It seems like there ought to be a sure fire way to make sure no content in a post will bleed CSS gunk to the rest of the page, but I haven’t found it yet. Anyway, this theme fixed my immediate problems. I think I’m going to decide on a layout I really like before I do anymore tinkering with PHP & CSS that I’m just going to throw away.