They'll also be popping up in the real world throughout various pages within the Fast Company web site, shortly -- where they will float in the content area of the page for certain applications. This was one of the reasons I didn't want to mess around with positioning, since it was needed to be bullet proof within an already complex CSS layout.
Simplified CSS Tabs Live Example
I realized from a few emails that it would make a lot of sense to point people to a live example of the CSS tabs described in the previous post. Here's a page where you can see them in action. View source for CSS and XHTML.