Petz, thanks for the article. Now I know where you're getting your numbers from.
Like I said before, unless they're running file-sharing networks, I don't see why average users ought to leave their computers on 24/7. It's even more wasteful than leaving a desk lamp on all the time.
Where does it list the testing methodology, the equipment used for the test, and the hardware listed for the system? If this data is to be credible, there needs to be more than just a table with numbers.