Gambler's Book Club (
www.gamblersbook.com) are selling the only two books on pineapple I know of. One short book/pamphlet on straight pineapple hi (discard before the flop) and one book on crazy pineapple hi/lo.
I haven't read them, so I can't comment on them. I am going to buy them though, since I am a big fan of crazy pineapple. If you happen to hear about another book on crazy pineapple (especially hi only) i would apprecieate of you'd let me know (either through the other poker-forum or by a pm).