Another great little Aussie invention; this little device can be fitted to your water cistern to prevent it from continually flushing and wasting water. The FixaFlush adapter can be fitted to most toilets and doesn't require a plumber for instillation. Basically the device only allows the valve to lift and stay lifted while your finger is on the flush control button, thus preventing you cistern from getting stuck and continually running.
Check out the FixaFlush website for details.