A study published earlier this month in the Proceedings of the Royal Society B suggests an earlier arrival of the dingo to Australia, through a mainland Southeast Asia route instead of island Southeast Asia.
Dingoes originated in China 18,000 years ago [Link no longer active]
Australian Geographic, 13 September 2011
Mitochondrial DNA data indicate an introduction through Mainland Southeast Asia for Australian dingoes and Polynesian domestic dogs
Proceedings of the Royal Society B, 07 September 2011