Update: Assange had an op-ed published in the Australian today:
WikiLeaks is not the only publisher of the US embassy cables. Other media outlets, including Britain’s The Guardian, The New York Times, El Pais in Spain and Der Spiegel in Germany have published the same redacted cables.[…]Prime Minister Gillard and US Secretary of State Hillary Clinton have not had a word of criticism for the other media organisations. That is because The Guardian, The New York Times and Der Spiegel are old and large, while WikiLeaks is as yet young and small.