We've complained here quite a bit about mobile apps which are nothing more than a pointer to the existing mobile web site. St George's new Windows Phone 7 app doesn't make that mistake, though its feature set is limited to checking balances on your existing accounts.
As Nick at Gizmodo notes, choosing Windows Phone 7 is odd, given that iOS, Android and BlackBerry all have a much larger market share. On the other hand, the tightly-defined interface guidelines for WP7 do mean that the banking app has a good chance of feeling like a native app. If you're a St George customer who has tried it, we're all ears to hear about your experience in the comments. The St George app is a free download for Windows Phone 7 users.