SizeUp [1] (paid but inexpensive) does that well. They also make a version that uses cursor dragging instead of keyboard shortcuts called Cinch that I use dail

SizeUp [1] (paid but inexpensive) does that well. They also make a version that uses cursor dragging instead of keyboard shortcuts called Cinch that I use daily. (I really wish they'd combine the two products for licensing purposes since they're 95% the same.) 1: http://www.irradiatedsoftware.com/sizeup/ http://www.irradiatedsoftware.com/sizeup/