DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.