My friend D of Hobbits, Home and Abroad is also a Phd student who is looking for information. It is a survey that is geared towards people who use a different computer at work and at home. I took the survey ( I am not generally a survey taker) and it was relatively painless and only about 20 minutes.
If this is you (different computer at work and home) and you have a few minutes to let D know about your computer use habbits, go ahead and helpout.
Here is the link to the survey.