[kevjiang]

Another really useful app is Spectacle, for keyboard shortcuts to dock an application the left or right half of the screen (like winkey+left and winkey+right on windows 7/8).

http://spectacleapp.com/

[tom_usher]

Slate is my preferred way of managing windows on OSX.

https://github.com/jigish/slate

[div]

Chiming in to plug SizeUp for this, wouldn't be able to live without it:

http://www.irradiatedsoftware.com/sizeup/

[Y0L0]

Also this: http://most-advantageous.com/optimal-layout/

[Jasber]

I really like http://sizewellplugin.com/ for this same thing

[rimantas]

I am using BetterTouchTool for that.