I bought myself a Plugwise system. The reason for this is that I can monitor my total power-usage, but I cannot see the details. I.e. : What is my refrigerator using? What is the freezer using? I can only see the sum of the total.
Plugwise made some nice hardware that allows you to monitor each device (or multiple devices behind on the same power-socket) to give you clear insight in the usage. Unfortunate sending and logging the information online will cost you a subscription.. I think for the price of the plugwise this should be a free service to store your data online for at least 2 years.