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It's actually really neat and I congratulate Transperth for being the first Australian transit authority to get involved with Google Transit. Nice one!
In related news, you can now add new places to Google Maps for any physical location in Australia (or New Zealand or the US). So if there's a local landmark, or a new business that doesn't appear on a Google map search you can go ahead and add it yourself.
Nice touch, and a good way to ensure visitors can always find a bus to catch to get home from a day's site seeing.