1140px Wide Fluid CSS Framework: 1140 Grid
1140 Grid is a 12 columns Fluid CSS Framework that fits perfectly into a 1280 monitor. On smaller monitors it becomes fluid and adapts to the width of the browser.
Beyond a certain point it uses media queries to serve up a mobile version, which essentially stacks all the columns on top of each other so the flow of information still makes sense.
This is really cool.