Responsive web design is becoming increasingly integral to all things built for the web these days. It is not enough to have a website and an app. it also needs to be possible for your users to log on from any mobile internet device. Whether it be Blackberry, Android, iPhone or a type of tablet having a sitebuilt with flexibility in mind is key.
Since responsive web design is still young there are few great resources for creating a simple functional folding grid system. Joni Korpi a Finish web designer has created the 960 Grid System of responsive site design perfectly named as Golden Grid System. The key features of GGS are the fluid grid, with folding columns, elastic gutters, and a zoomable baseline grid. In addition it comes with Golden Gridlet a script, which allows you to see the grid overlay so you can easily check your math.