I've become so used to aligning windows to a grid on Windows (via Win+Arrow Key) and Linux (via Compiz Grid) that when I sit down at a Mac I want to gouge my eyes out trying to align windows.

How can I align windows to a grid in Mac OS X? Do I need to install an application?

Here is an [example of Compiz Grid plugin](http://www.youtube.com/watch?v=cHMKhiZmlV0&hd=1).