Bix

I remember MrsD explaining how Dagboy flipped up cane toads with a golf club and knocked them for six as they fell out of the air. I guess his handicap must be coming on in leaps and bounds

Anyway, to the serious part of this thread.
Toads are "good for the garden" in UK so why not in Aus ?
Don't they help keep other pests like mozzies under control ?

ABCDiamond

Cane Toads (not your average toad)
were introduced to the sugar cane fields of Queensland earlier this century, to control cane beetles. Since then they have spread throughout the moist coastal region of Queensland and northern New South Wales. They have also moved inland, mainly by following creek lines and spreading out during floods. These animals produce a powerful poison which can kill the predators that eat them. The toad's eggs are also poisonous.
Impact on environment

The effect of the toads on native ecosystems is still unclear. The northern spotted quoll (native tiger cat) has diminished in areas with cane toads. We know that the carnivorous quolls attack their prey fiercely in the neck region. This is where the toad's poison glands are and quolls quickly die from the encounter.

It therefore seems likely, although it is not proven, that a decline in quolls can be attributed, at least in part, to the cane toads. Goannas and snakes may also be killed when they try to eat the toads. However, recent evidence suggests that goannas can be become 'toad-wise', learning to leave the animals alone after a taste of the poison on the skin. It is also possible that the cane toad's eggs can poison the tadpoles of other amphibians, which eat eggs.

They even kill Crocs ?? !!

Peter

Many family dogs die after having a munch on them. Kids pick them up and play with them, and being kids, will probably lick their fingers afterward. They've encroached upon the ecosystems of native frogs and other animals.

Trevglas

It is interesting to note that whilst the cane toad was introduced to control cane beetles, but the whole scheme was a total flop. Not only did the cane toad reak havoc on the Australian environment, it didnt even bother eating the cane beetle!

To follow on fom what Ulujain mentioned, crows have also now learnt how to eat canetoads: the just flip them onto their backs and eat them from underneath.

All the cane toads at our new house are very small, but we find many "empty" toads around: we also have a truckload of crows in the area!