I happen to hear that game-books like the ones I used to enjoy so much are coming to the iPad. I gleefully get to the App Store and get The Temple of the Spider God. No less because it has been written by Jonathan Green, who is a veteran of Fighting Fantasy books.
This adventure-anthology for 3.X is 200 pages long, 1 page front cover, 1 page editorial/ToC, 1 page appendix for references and bibliography, 1 useful page-appendix with 80 items miscellanea, 2 pages of SRD and 1 page back cover, leaving 193 pages for the adventure anthology.
This pdf from Raging Swan Press is 34 pages long, 1 page front cover, 1 page blank inside of the front cover, 2 pages editorial and ToC, 1 page advice on how to read statblocks for novice DMs, 1 page advertisement and 1 page back cover, leaving 27 pages of content for the new Dhampir playable race.