According to the Sydney Morning Herald, the Supreme Court of New South Wales has upheld the enforceability of an online sale on eBay (Judgment in Smythe v Thomas now available online here).
The successful online bidder of a vintage WWII plane sued the seller after the seller refused to complete the sale. (The seller had been offered $100,000 more off-line by someone else). The online buyer won the case.
Business 2.0 also reports on an advance in online contracts: Tractis, the first Web platform that lets users create, manage, and execute contracts online from a Spanish startup called Negonation. (via law.com)
For a refresher on the Australian law see my March 2006 post here.