We got told about it back in October, but the Commonwealth Bank's Kaching app, offering NFC functionality and the ability to send payments to others, is now officially available.
To use the NFC functionality and pay at PayPass terminals, you'll need an iCarte case from the bank (costing $49.95 plus $5 postage) and an iPhone 4 or 4S. However, everything else will work on any model of iPhone.
The bank has said an Android version is coming, but hasn't set a release date. For a fuller overview of what it offers, check out our Kaching first look.
Kaching [iTunes App Store]