Timesnapper

Timesnapper (http://www.timesnapper.com/) is a free productivity tool with a very simple idea it it's core: it takes screenshots of your computer screen every five seconds, and allows you to play them back as a movie. You can see your entire workday replayed back to you in minutes. Thus, you can see at a glance how you spend your day, and perhaps find ways to streamline your workday (e.g. quit checking your email every five minutes).

Frankly, it's also just fun to watch your workday fly by in the space of a minute.

It won't fill up your hard drive with images of your computer screen, as they are automatically deleted after a set period of time (which you choose). You can adjust the resolution and format of the screenshots, and how often the screenshots are taken. You can also adjust the speed of the playback.

The professional version, at $24.95, gives you more productivity tools to work with, such as customized reports detailing the percentage of time you spend on selected applications, amount of time you spend on the computer each day, recording screenshots only of certain applications, and much more.

Both a trial version of the Professional version, and the free classic version are available at http://www.timesnapper.com/. Scroll to the bottom of the page to get to the free version.