Here's an interesting one. NSW and ACT households can get six energy-saving lightbulbs for free and in some cases also an AAA-rated showerhead. This will help you save money on your electricity and water bills, as well as helping the environment. It's part of a carbon trading agreement between EasyBeingGreen and the NSW Government - more info here.
There's a discussion thread here in our forums. There's also an interesting article about the effects these lightbulbs can have on climate change, with further discussion on Slashdot.