TheProphet, I had a look at ATO website and this is what they say about CGT.
http://www.ato.gov.au/individuals/content.asp?doc=/content/20427.htm&page=6&H6
"CGT is not a separate tax, but a component of income tax. This means that the rate of tax you pay on a capital gain depends on your other income (see Individual income tax rates)."
Therefore, the tax rate applied to CGT is your marginal tax rate + medicare levy.