The Paleo diet or Caveman diet as it's also called, to me, seems pretty logical. The basics are "High Fat, Low Carb", no grains, lots of meat, no sugar no "processed" food and no dairy, nothing that comes in a box. Scroll down for a list of Paleo foods that I bought from Coles Online so you can get an idea of what's Paleo "allowed" and brand names for items like Ghee and Lard, it's a decent example for a start anyway. Bear in mind people adjust and tweak their Paleo diet so it suits them better, if you don't like certain foods you will need to make adjustments.
Victorian Farmers Markets
I'll try and find other states as I go, stay tuned :)
Please Note: The links below are an American site, therefore they care less about other areas of the world, I emailed them to add Kangaroo Meat under the "Game meat" category, it fell on deaf ears of course, so while they do have some great info, it is very USA centric, so you may not recognise some of the foods listed. In this case google is your friend. I will endeavour to keep searching for great Aussie Paleo web sites
Paleo diet food list
Paleo Diet Lifestyle page on G+