We've complained in the past about NAB, Commonwealth Bank and St George rolling out Android "banking apps" that are little more than glorified bookmarks to a mobile banking site. That's not because cross-platform mobile sites aren't awesome, but because an app should do more. We don't have a St George account to test the service directly, but its latest update to its Android mobile banking app appears to have slightly improved on its previous offering.
The big change in the latest Android release is the ability to store your login details so you can check your balance simply by entering your password. That should make the "have I been paid yet?" monthly or fortnightly checking process a little easier, though it seems the mobile site may well still be involved at some point.
The app is a free download from the Android market.