I have used the 960 Grid System on a few projects and wanted to include it in the use of a recent work related project. Problem was that I needed to utilize more than 960px of the screen.
The solution? I adapted the 960 16 column grid system to be used as a 1120px 16 column grid system.
The 1120px design scheme allows for each of the 16 columns to be 50px instead of 40px wide, while still keeps the 10px margin on the left and right which creates the 20px gutters.
While this is fairly specific to my needs, it may solve someone else’s problem as well.