One issue has come up time and time again with 6.1, There isn't a built in responsive grid system for Liferay 6.1. Version 6.2 uses twitter bootsrap. Here are 10 pure css layouts that overwrite the default layouts that are provided in Liferay. When the screen is resized all of the columns stack. This is a simple solution to instantly get a responsive website for liferay 6.1.

PURE CSS RESPONSIVE LAYOUTS in Marketplace