It used to be that the ABC News RSS feeds were only available by subscription, but it looks now like they’ve groked the RSS mindset and made them publically available here for non-commercial use. The reason that I’ve said they’re the official ones is that some folks got fed up at waiting for the ABC to "get it" and made their own via screen scraping.
I’ve added their breaking news RSS feed as a block just below the BBC news feed on the left.