A unanimous Full Federal Court in Australia today decided that a computer implemented method of creating an investment index is not patentable, on the basis that the substance of the claimed invention – an abstract idea or scheme – was itself not patentable subject matter, and simply implementing that invention via a computer would not render it patentable.
See Research Affiliates LLC v Commissioner of Patents  FCAFC 150
See also this case note.
Many internet related inventions may not be patentable subject matter in Australia as a result of this decision.
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This website has some useful links and references: http://www.epiphanysolutions.co.uk/article-index/rights-and-laws-of-the-internet/