Tourism Australia's website is one of the best places to start planning your trip. As well as general information, they have package deals and searchable listings for U.S. travel agents who specialize in Australia.
Tourism Australia (www.australia.com.)
Each Australian state has its own tourism website where you can find state-specific maps, thematically organized listings, travel information, and links to accommodation and transport. Some have free state travel guides that they'll send to you. In general, they handle queries online.
Australian Capital Tourism (www.visitcanberra.com.au.)
South Australian Tourism Commission (www.southaustralia.com.)
Tourism New South Wales (www.visitnsw.com.)
Tourism Northern Territory (www.travelnt.com.)
Tourism Queensland (www.queenslandholidays.com.au.)
Tourism Tasmania (www.discovertasmania.com.)
Tourism Western Australia (www.westernaustralia.com.)
Tourism Melbourne and Victoria (www.visitvictoria.com.)