Divvy

The Problem:
Managing windows on Mac OS X can be frustrating, requiring precision control of your mouse or trackpad for clicking, dragging, pushing and pulling your windows to the size and position you desire. Even with all this work, it’s very difficult to get windows exactly where you want them, so most of the time windows are left scattered all over the screen.
The Solution:
Divvy is an entirely new way of managing your windows. It allows you to quickly and efficiently "divvy up" your screen into exact portions. This lets you take maximum advantage of your screen real estate without any hassle at all. Window management has never been this easy.
With Divvy, it’s as simple as a single click and drag in the Divvy interface and your window will be resized and moved to a relative portion of the screen. If that seems like too much work, you can go ahead and create as many different shortcuts as you'd like that resize and move your windows.
Divvy is designed to be quick, simple and elegant, staying out of your way as much as possible while providing the most powerful window management available today.