Australian geography:
http://www.about-australia.com/maps/ http://www.mapsofworld.com/australia/thematic-maps/australia-climate/climate-map-of-australia.html http://www.mapsofworld.com/physical-map/australia-physical-map.html
Backpackers: http://www.yha.com.au/ http://www.backpackaround.com.au/backpacker_accommodation.html
Find Flatmates: http://flatmates.com.au/home.html http://au.easyroommate.com/ http://flatmates.yourestate.com.au/ http://www.reservations.bookhostels.com/easyexpat.com/index.php?ChosenCountry=Australia&ChosenCity=Sydney&SubID=fr
Wwoofing and others: http://www.wwoofinternational.org/ http://www.helpx.net/
Other accommodations: http://www.stayz.com.au/ http://www.camping.com.au/ http://www.aussiecamping.info/
Mobile Phones: http://www.vodafone.com.au/personal/index.htm http://www.telstra.com.au/ http://www.optus.com.au/home/index.html http://www.virginmobile.com.au/ http://www.dodo.com.au/public.aspx http://www.3mobile.com.au/
Travel by plane : http://www.flightwest.com.au/ http://www.australianairlines.com.au/ http://www.jetstar.com.au/ http://www.nationaljet.com.au/ http://www.qantas.com.au/ http://www.skywest.com.au/ http://www.virginblue.com.au/
Travel by car: http://www.budget.com.au/default.aspx http://www.avis.com.au/car-rental/avisHome/home.ac http://www.europcar.com.au/ http://www.carsguide.com.au/ http://www.carsales.com.au/ http://www.australia.gov.au/topics/transport/registration-and-licences