I have to agree. I saw the movie last night and now want to read the book. But not available on iBooks. Yes, I have the Kindle, Kono, Nook, Stanza, Google Books, etc. apps. They all suck as far as I am concerned. For the following reasons:
iBooks is the only e-books marketplace that has an integrated library and store. All other apps drop you into a browser. This is undoubtedly intentional on Apple's part, but still, it makes it far more convenient to buy books on iBooks than the other apps.
Suppose you download a sample of, say, a Nook book, you read the sample, and now want to buy it. You then click "Buy". You get dumped into Safari on the BN home page. Don't they know that you are reading The Hunger Games? Of course they do. But no, you have to search for The Hunger Games again, and then purchase the full book.
Then the thing that absolutely astounds me about how brain dead these guys are. If I read an iBook sample, then purchase it, when I download and open the full book it takes me right to where I left off so I can keep reading. Not the Nook app! No, nor the Kindle app either. They take you to the beginning of the book, and you get to flip through until you find out where you were. Great!
Then there is the beautiful interface of the iBooks app. It makes the Nook and Kindle apps look so plain by comparison. The nice animation when you flip pages. The nice bar at the bottom showing where you are. It is all just so beautifully done.
But, again, I cannot read The Hunger Games on iBooks. Grrr! I think I'll find something else to read.