I got to thinking... if you took the results from the Google desktop search tool and made some charts and graphs would it be a picture of your work life? I think my results would be interesting. You could take topics such as elearning, marketing, timesheets, and see how many results you get.
I guess this would be true for just charting the existing meta data for any files on your pc, but the Google tool seems to make it a bit easier. I'll have to try this some time.
If you do let me know if it provided any insight into your history.