Looks like we've got another addition to our list of cool services Google offers that don't work yet in Australia. The company's new flight search option finds cheap fares, but right now it only works with US cities.
Despite that limitation (and the fact that it only seeks out return flights), it's still a potentially useful option if you are planning a US trip. You can filter flights to include only non-stop options, and restrict results to a particular loyalty program (such as oneworld or Star Alliance). I hope this one does show up in Australia eventually.