Footnotes without Markdown?

Can be done with CSS, though it is not completely automatic. I have extra quicktags to put the markup in, so it’s easy.
CSS:
.footnote {
font-size: .9em;
border-top: 1px solid #a9a9a9;
line-height: 150%;
margin-bottom: 15px;
}
At the end of the post:
<div class="footnote"><sup>1</sup>My footnote</div>

Just thought I’d add my solution to this thread as well.

New WordPress Plugin: Footnotes

S.