I've set up a site to experiment with various layouts: MS3 layouts here.
Well, layouts is somewhat audacious, as there is but one today... But there will be more! I will analyze the comments on my osCommerce blog entry and add layouts. The requirements and a few comments are included in the page. I won't repeat them here.
Fell free to download the HTML and CSS — If you want to submit a CSS that uses the current markup, mail it to me; if you require a different markup, mail both HTML and CSS, I will upload them and report here. Please don't post entire files in the comments, as it makes very hard reading.
Please note the HTML and CSS validate. I would like to keep it that way.
Note to self: check with Harald if we're not using XHTML instead.