The Code Project has a project by Pedro Maia Costa based on an HTC we put out for a Web Team Talking article a couple years ago.  NIce job, Pedro.  For me one of the great benefits of writing on the web in a developer community like blogs.msdn.com is that you often get good feedback from developers running into the same sorts of problems as you.  And many times you'll discover a solution that's pretty elegant.  I think the best solution to make column headers fixed on an HTML table in IE is this one by SlingFive.  No HTC, no script save a simple CSS expression.  Simple, nice.