RescueTime is a great web-based time management tool that allows you to see how it is you spend your time. RescueTime tracks your time down to the second without you having to actively track it, there are easy time-management analytics so you can know how much time you are spending on an application, site or a category. RescueTime will also soon be able to provide you with the ability to set up time management goals with notification when you meet or fail to meet your goals. It's free to sign up to an account and is available for both Mac and Windows.
This has really made Tim's computer time on different applications. clients and other things more visible and very revealing!