Having being repeatedly swooped by magpies as a child, I'd personally like councils to shoot them all. Failing that, knowing where they can be found is a useful step for planning a hassle-free trip.
The Magpie Attack Hotspots map lists locations in Sydney where there's a known magpie waiting to swoop. The site was built by Cumberland and Courier Newspapers, based on reader submissions.
If you know of similar resources in another state, or have a more sophisticated solution to fighting them off than whacking them with a tennis racket or wearing an ice cream carton on your head, share it in the comments. Thanks Simon!