Sadly as designers and developers we still have to contend with IE6. Riddled with quirks and bugs, IE6 is anything but easy to troubleshoot but in your case you should try some basic things (this assumes you have control over
http://eftclinic.com/). Since you're using CSS to position the content into columns, try making one of the columns less wide than it is by 3 to 10 pixels. IE6 deals with floated divs in an odd way and while Firefox and Opera may display them properly, IE6 can introduce added padding that throws the positioning off. For example, if you change your CSS width declaration for your right ID selector (#right) to width: 450px;, you'll see IE6 lines things up much better. Check out positioniseverything.net for loads of great info on IE6's quirks and how to deal with them.
Oh and BTW, in Firefox the index page still doesn't render 100% correct. There's text in the "How EFT works" paragraph that's positioned oddly.