I like to use my personal site as a proving ground for new ideas.
A responsive layout adapts to fit the screen no matter what size device the user has. This flexible, one-web approach results in true cross-platform support without burden of native apps or the need to invest in device-specific ecosystems.
Just over a year later, responsive design has become common technique used by most forward-thinking web designers. See Why 2013 Is the Year of Responsive Web Design on Mashable.