I'm not sure if this is the right place for this, but I thought some of the birders (if they don't already know about it) might be interested in the Australian Birds app for iPhone. I found it while searching for recordings of bird calls and, although a bit pricey, it seems to have good info and includes bird calls, usually several for each species.
Does anyone else use it and, if so, what do you think of it? Have you found it useful? I can't see it completely replacing my field guide, but it would be the guide that's always with me, at least.