It's nice to get something for nothing, and few things as cool as an interactive magazine. Here are three free Aussie magazines designed for the iPad that I really like.
Travel. The Qantas magazine, with heaps of travel features. Very slick.
Science and technology. (1) Venture, published by the Swinburne University of Technology in Victoria. (2) e-Science, published by the University of Adelaide.
All are available in the Apple App Store. Great fun, and you learn stuff too!