One of the newest CSS frameworks, Groundwork appears to be on that will stick around. - http://groundwork.sidereel.com/home - There is no better way to design for Groundwork than with the Fireworks Toolkit for Groundwork. Enjoy!
This is why I created FireworksToolkits.com. Now savvy designers can use these toolkits to design apps where the developers are using Groundwork.
If you have any questions, take a look at the FAQ page!