iOS/Android: The Commonwealth Bank's Kaching app came out for Android in July. Android users running Jelly Bean got a nasty shock when they updated their devices (or bought a Nexus 7), with the app not working on devices using the newest Android version. According to the bank, that problem has now been fixed as part of an update that also makes it easier to share payments with other Facebook users.
That update means that rather than having to manually collect payments if they're sent to you from another Facebook user, the money is sent directly to your default bank account. This eliminates the fiddly process where you would be told on Facebook that you had a payment, but then had to authorise receiving it separately. This is already live for Android, and will be added to iOS "in the next week or two". The bank is continuing to work on a Facebook-only version of Kaching, which I continue to think is a bad move given Facebook's patchy security record.
Kaching changes for the better [Blog.CommBank]