TIP: Raintap

This is a great idea! I'll think I'll get one!
I quote directly from the EcoShop site where you can buy one for $49:
"RAINTAP:
One millimetre of rain on the average roof generates 250 litres of water. Normally this runs off your property and is wasted. But by fitting a raintap to your gutter downpipe, you can divert that water to your water storage tank, lawn, trees, plants or pool to make maximum use of even light rainfalls. Suits all downpipes by using 90mm adapters (readily available).
Installation: Can be fitted by a home handyperson in about 10mins. You will need a hacksaw to cut your existing downpipe. Simply pull downpipe towards you and fit bell end of raintap to the top cut in the downpipe. Position raintap above the bottom cut of the downpipe and pull down until the bevelled end enters the bottom pipe."