Cheap and so easy to negotiate, even with a surfboard! Helpful drivers who often wait for you to be seated before driving off, a real shock for any visitors from London.
check the excellent website
www.131500.com.au/
to get you from place to place
Updates
Great tip! You can also get a Daytripper pass that will get you around Sydney on it's trains, buses and ferries to take you wherever you need to go.
Is this your business?