Light bulbs

Australia leads the world (apart from Cuba who got there first)...

http://news.independent.co.uk/environment/climate_change/article2290051.ece

If you're not into saving the environment, change your light bulbs to save money and get the Brownie points for free. (It's a significant cash saving even when you allow for the extra cost of the bulbs. It's still cost-effective even if you have to buy a new light fitting - the electricity savings are that good.)