Dunstan uses Javascript to sniff for browser width, take scope of the browser’s window dimensions, check for the amount of screenspace, and determine whether to use a one-column list [with the width of the list items allowed to flow across the width of the parent container] or a two-column list [with the width of the list items fixed to allow the columns to float nicely].

I can think of some interesting tangential applications to that. If you got really anal about this and had a few design elements that you wanted to appear one way in a large browser window but another way in a smaller one, you could certainly do it. Differentiation by browser screenspace may not be easy, but it’s slick.

[Dunstan has since updated the script based upon reader input ... and once again for good measure.]