A while ago, I was talking to a colleague about rising heating oil prices. Some people apparently club together with neighbours to arrange group orders. This keeps prices down, and also saves some CO2 because the tankers have less driving around to do, and helps keep rural traffic down a little bit.
I suggested that a web site to assist with these group deliveries would be useful. Of course, I've now discovered that it already exists! BoilerJuice.com has price history charts, arranges buying weekends (they group online orders by postcode), has security tips and products (heating oil theft is rife).
One feature that it's missing, though, is energy efficiency tips. Well, it has user comments on the blog.