twitter/bootstrap — pull request #2145 by bobbymarko (2012-02-21 18:35:20+00:00)
Title: [2.0.2 wip] Added push and pull classes to grid system to allow for shifting of columns in responsive layouts without changing source

Zurb Foundation has some nice classes for shifting columns based on a collection of push and pull classes. I added those to Bootstrap: http://foundation.zurb.com/docs/grid.php