Best Time Management App Ever. Yes these kinds of things excite me.
It tracks your usage on your computer, tells you how much time you spend on Illustrator/Excel/the Internet etc. It knows when you're active in a particular program. I've not used it for work yet, (or for less than 36 minutes) but it's bloody brilliant. You can put in goals such as time spend on Calendar/Email/Designing and it shows you how you're tracking and where you're overusing your time. I usually use the 'a time logger'/'eternity lite' apps for iPhone but this is so much better. Effortless.