I've written an app for iPad and iPhone that like Goodreader allows you to download the ERSA from Airservices Australia.
Unlike Goodreader, the app has all the separate files indexed, so you just click on the airport you want and it downloads that PDF :-)
Without distributing the ERSA itself (which is copyright), shouldn't need approval from Airservices Australia as its no different from downloading the publicly available ERSA using firefox/safari/Arcobat/Goodreader.
So unless anyone here is strongly against me publishing "iERSA", I'm going to submit it to apple for the app store.
I'm working on a "download all" option and full text search which would be available in future release.