I've started to get a page working more-or-less ok in IE6 ( the main problem being position:fixed) but it actually needs different html, not just different css: I'm using a semi-transparent png with fully-transparent sections as a major background, and for IE6 I think this needs to be replaced with a straight gif with transparent sections. Never mind the transparency.
So, within conditional comments, how do you redirect to an IE6-only page? or is there another way? Maybe with IE's filter thing?
Off the top of my head, I'd bring the image up as a background image of a div - specifying div height and width - and then use a conditional statement to bring in a version of the CSS class that calls up the gif rather than the png. Personally, I avoid the problem by not using png image files - and shall do that until I stop writing code that allows for IE 6.