I’ve been using a Mac for the past three years, so when the slick Windows 7 Snap feature came out, I admit, I was a little sad I wasn’t in the market for a new Windows OS. Enter ShiftIt, a utility for Mac which replicates the behavior of Snap. The Shiftit dropdown menu sits in my menu bar, and I can resize windows using either the dropdown menu or shortcuts. I use it primarily when I’m writing outlines for papers, so I can have my outline, notes, and research windows sized well together.
Admittedly, you don’t need this app to resize windows such that you can see more than one at once, but it makes the process much more zippy, accurate, and convenient.
(ShiftIt works with Mac OS 10.5 and 10.6.)