It has never been easier to quickly create responsive columns in WordPress, and you do no longer need to mess around with shortcodes. Visual Columns is a 12-column fluid grid system that easily lets you add columns to your WordPress powered website. The fluid grid system uses percents instead of pixels for column widths. It ensures proper proportions for key screen resolutions and devices.
Demo: http://codecanyon.net/item/visual-columns-for-wordpress/6505510