There are very few applications these days that completely change the way I use my Mac, but Cinch is definitely one of them. Cinch lets you resize your application windows to be fullscreen or half-screen, just by dragging a window to the edge of your monitor.
Drag a window to the top of your screen, and it becomes full screen. Drag it to the right hand side of the screen, and it takes up the right half. Very simple, very straightforward. Although it doesn’t work for all applications (including Parallels windows in Coherence), but Cinch does work for most.
The other amazing thing about Cinch is that it’s actually based on a Windows 7 feature called Snap. It’s hard to believe that such a great usability feature would come from such an unusable operating system.
So go download Cinch – it has a free trial but it’ll be $7 well spent.