If you are not accurately recording your time then you may be losing money. Precision Time Tracker provides an easy way to keep track of how much time you spend on tasks.
It is designed to make it easy to remember to start and stop the timer. It can even stop the timer automatically when there is no activity on your PC.
Add as many task as you need and keep a separate timer for each task. When you start the timer it will stay on top of all applications so that it's always visible.
Use Precision Task Tracker to make sure you don't miss any billable hours and measure your productivity.