http://www.alistapart.com/articles/switchymclayoutSwitchy McLayout lets you define the dimensions, information richness, and appearance of your content objects for set ranges of screen sizes. A news site, for example, could have one layout and appearance for wide screens, one for medium-sized screens, and another for PDAs. Images could shrink or even disappear according to the screen size, columns could come and go as needed to maintain readability, and you can achieve a more efficient use of the available space for each screen size.
Looks interesting, though you need to 'view source' of the demo page and then view the JS using the FF web dev toolbar to get at the JS code.
