Top 500 sites in Australia as reported by Alexa, take it with a grain of salt but it is handy for SEO to get an indication of which search engines Australians are using.
Google fills first and second places, which fits with data collected on my sites. Yahoo are next and then MSN.
Interesting to note Yahoo tops the rankings in the United States. I would suspect the figures are a little skewed to the type of web user would would install the Alexa tool bar.