Good visual examples of a variety of CSS layouts (click on thumbnail to see each one in action) that all share the same underlying HTML markup. Good quick reference for simple sites I think.
In November 2005 I presented on pro.html.it a three-part article on creating CSS layouts using techniques like negative margins, any order columns and in some case opposite floats. The main goal of the article was getting the maximum number of layouts based on the same markup, each with valid CSS and HTML, without hacks nor workaround and a good cross-browser compatibility. The result is a set of 40 layouts that we’ve thought worth sharing: on each of them you’ll find also a download link (if you want, you can download the entire collection, 40 HTML pages in a single zip file). Further details can be found below the gallery.