I just wanted to add my two Australian cents to the rest of the great Oz films mentioned here.
Wake In Fright has more of an arthouse bent to it, but it's an extraordinary film nonetheless, about a school teacher who gets stranded in a brutal Outback town and with nothing to do, gets drunk, gambles his money, goes on a night-time kangaroo hunt (in which real kangaroos were killed on camera), gets drunk again and is raped by Donald Pleaseance. Fans of Kafka and clastraphobic sweaty Italian Westerns will love this one, and I would highly recommend anyone interested track down the very fine Madman Blu-Ray (Coded for ABC)