Our public transport system is quite effective. Trams across most of the city every 9-10 minutes during the day, and 15-30 minutes apart at night. And also plenty of bus lines throughout, especially in the less densely populated areas, once every 15-30 minutes. The trunk bus lines run every 5 minutes during peak hours, and every 10 minutes outside that during the day. 15-30 minutes apart at night.

For most journeys, there are multiple paths you can choose, if a certain line has a problem (accident, delays, et c), so that you still get there, even if it takes a bit longer.

A pass valid for a month costs the equivalent of US$70, but you can also buy cards with a certain number of "tokens", that you can use whenever you need, if you're not a frequent user (like me). If you're really unprepared, you can buy a ticket from the bus driver or from a vending machine (on the trams), but they're quite expensive compared to the other options.

A single journey paid for using tokens or cash, is valid for 90 minutes throughout the city, no matter how many times you get on a new tram or bus, or which direction you're going.

All in all, a great public transport system. And yet, a majority still prefers to drive even for short journeys. The lure of the automobile is terrible...

Here's a short film I've made showing mainly trams, but also buses, passing through the main hub of the public transport network.
http://www.youtube.com/watch?v=XHXtCS_gHpA