Maybe Aussie comic stores buy a few titles for shelf stock on spec because they know people are less likely to order them via the Diamond Orderpak? I have at least three volumes of books on comics writing, all bought after seeing the books while browsing.
Some others: The Powers Scriptbook and The Ultimate Spider-Man Scriptbook, both by Brian Michael Bendis, the writer of the aforementioned Avengers #500.
Wow. The last post in this thread was posted when Bush was still President. There was a more recent thread here, but it's been a while since any one has commented.