Software that proves you are working rather than playing games or surfing!

Hi
My boyfriend has recently criticised me for spending too much time on my laptop. I would like to prove to him I am working rather than playing games. Does anyone know of software that could track what I am doing and graph work against play? The research I have done has all pointed me in the direction of key loggers but that is a bit over kill for what I want. Any ideas?
Cheers