If you try the code, you'll see that the "Site Map" link is not being enclosed in the #breadcrumbs div. In Firefox, it's kind of half-in and half-out. In IE, it's all the way outside the border below the div.
I wanted it to be enclosed in the div, just like the rest of the text, but at the right-hand edge of it. This should be simple, and I should at least be able to figure out what's actually going on...maybe I'm just out of practice.