iOS: Scan2List is one of the few shopping apps we know of that makes an ongoing effort to support Australian barcodes, letting you assemble a shopping list by scanning the products you regularly buy. Version 1.4 adds additional barcodes and store locations, as well as a daily deals section highlighting specials available that week.
The new version also eliminates an issue some commenters complained about in earlier versions: you no longer have to register to use the app. Right now, Scan2List is still iOS only, but the developers say an Android version will be "tested in the next couple of months". It's a free download for iOS users.
Scan2List [iTunes App Store]