CSS Toolshed: A CMS Zen Garden
The CSS Toolshed is a CSS Zen Garden-like site. What makes it different from the original CSS Zen Garden is that instead of just a single, static page it consists of several pages filled with different kinds of content, simulating a CMS-based site and reflecting more of a real-world scenario.
Chris Heilmann created The CSS Toolshed to convince high level CMS vendors that CSS works well on sites that are based on different templates and have wildly varying content. He is now looking for design submissions: Who is up for a CSS challenge?. If you're up for it, here's a chance of showing off your design and CSS skills.