I'm exploring the concept of application usage tracking on my machine to better understand what I do everyday. In doing so, I ran across ManicTime. I'm going to give it a try and see what it yields.
UPDATE: Love this tool. After two weeks of use, I'm able to generate pretty pictures and statics of my usage. It even tracks web site usage. This has been handy as we use Atlassian's Jira (web based tool) for our bug tracking.