What takes up the most power

http://www.howstuffworks.com/question272.htm
http://www.itfacts.biz/94-of-families-with-small-and-teenage-kids-have-a-pc-90-a-tv/6717

These are two interesting posts about how much power each electronic device takes up while plugged in on a daily basis.

And an energy calculator so that you can figure out how much you are spending a month on electricity for your different devices. 

http://michaelbluejay.com/electricity/howmuch.html