The Divine Grid is a fluid, responsive CSS grid framework based on the divine proportion, also known as the golden ratio.
For more information, see here.
For a demo, see here.
Finally, have a gander at the Divine Template - a fluid, responsive CSS template based on the Divine Grid.
Thanks to Harry Roberts, creator of inuit.css, from which the Divine Grid draws heavy inspiration. Also, many thanks to Nicole Sullivan for pointing out the secret benefit of the overflow property and making the media object a common practice. Finally, thanks to Ethan Marcotte for teaching me everything I know about fluid grids and responsive design, and to Chuck Greene for teaching me about grids in general.