Gentoo Optimizations Benchmarked (Linux Magazine)

Poor house insulation has a non-trivial impact on your electricity (/gas/oil/whatever) bill. Which tends to be a bit of a problem in the UK, as it isn't really cold enough to make people tackle the problem seriously :) (I have been in flats here in Germany which kept a comfortable inside temperature when it was -15°C outside and the heating was off (turned off by the thermostat).