I tried out the Microsoft one. Perhaps it's because I had to use a fake zip code (US only, so I used the most northern little town in ND I could find), but I found most of the recommendations have no bearing on what you actually tell them.
For example, even though I told it I have a geothermal system and 100% CFL lights (which I do), it's recommendations still said I should replace my incandescent bulbs, and replace my furnace with a more efficient one.
For energy bill tracking, it looks decent.
I'll try out the other ones in a few hours; time to go find some more air leaks.
Charlie
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