The Null Device
Via this Age article (which says that "Wi-Fi" stands for "Wireless Fidelity"), this list of Wi-Fi hotspots in Australia. All the ones in Melbourne seem to be concentrated in the CBD or south of the Yarra (with the exception of a lone one in Glen Waverley), in the sorts of places that won't look amiss on corporate expense accounts. Of course, in Australia, it's a safe assumption that 99% of wireless internet users are executives working on spreadsheets on the road or something (as opposed to, say, San Francisco or New York, where the big market seems to be hipsters with iBooks that match their trucker caps using them for collaborative Photoshop jams or whatever).
The other day, though, I saw signs in the food court on Lygon St. (outside the Cinema Nova) advertising that they have wireless internet access there.