I spent this evening fixing my site for Safari. I didn't really care before since I'm an avid Firefox user, but I've recently had a change of heart. I've been really digging the RSS capabilities of the new Safari and I figured it's only about an hour or two of work to make it look pretty.
I'm still not exactly sure what was the matter, but after restoring the original template and re-incorporating my changes, I seem to have fixed it. My guess is that I messed something up when I was editing the template. Nevertheless, it's rendering exactly the same as Firefox, which makes me quite happy.