For more efficient window management, Divvy is worth the price

Divvy has become an essential part of my workflow in terms of how I manage my open windows. It is simple and easy to use yet is extremely intuitive and robust at the same time. Esp on OSX without the more useful Windows 7 features to drag to the edges of the screen to resize my window to that half portion, Divvy is a way to get it done. Keeping again with OSX themes you can create your own keyboard shortcuts to resize windows to your liking. Perhaps a little pricy, but definately worth the price of admission if efficient window management is important to you.

Computerfreakz99 about Divvy - Window Manager, v1.3.4