I fixed it: The content I was having issues with was loaded via AJAX, and on that "page" I included jQuery and the jQuery tablesorter script. Well, it also turns out that the page I was loading this content into also included jQuery. Apparently IE doesn't like that very much. Firefox, however, could care less.
Just thought I'd share with folks so they can avoid this problem. Don't load jQuery twice, or IE will puke over itself.
