A simple css add-on to the popular 960 grid system that comes with adaptive grid defaults for small screens, tablets, and mobile devices.
The 960 Responsive Grid uses CSS media-queries to do all of the responsive magic. Hopefully this will help people who are looking to make an existing 960 grid site responsive without having to re-do the whole grid system. If you are able to restructure your sites grid there are tons of great systems out there with responsiveness already baked in.
Assuming you are already using the 960 grid system (960.gs) all you have to do is place 960-responsive.css somewhere after the original 960 grid css, like so:
<link rel="stylesheet" href="960.css" />
<link rel="stylesheet" href="960-responsive.css" />