HappyCow is the world's most complete listing of vegan restaurants. Vegan Australia recommends everyone use HappyCow when looking for restaurants and stores in Australia (or anywhere else in the world!). We also encourage you to add any new places you find and update and give reviews to keep the website up-to-date.
From their website: "HappyCow was founded in 1999 as a public service to assist travelers and people everywhere find plant-based / vegan options and healthy food. We are vegan-run, from a vegan perspective, and staffed by vegans and vegetarians. Today, our online community has grown to include members from around the world who are passionate about the vegan lifestyle as a healthy, compassionate, and environmentally sustainable way of living. More than simply a restaurant and health food store guide, HappyCow is an ever-evolving online hub that serves millions worldwide each month."
The Australian pages, together with the number of listings for each state, are here: