Didn’t know this existed at all, but apparently Jesse Schell recreated his own Deck of Lenses (the companion to The Art of Game Design: A Book of Lenses) as a free Android app: Art Of Game Design: Lenses.
That’s pretty neat actually. Unless you’re carrying the deck with you on a daily basis, you’ll find you’ll often need the cards when you don’t have them available. Now it’s a matter of activating your smartphone and flipping through the selection (or choose the ‘random card’ option under menu). And I’m sorry, but there doesn’t seem to be an iOS equivalent available.
Should you also wish to convert the tome itself into a more portable format, then you can find the Kindle edition of Schell’s book over at Amazon. Be warned though; its price tag is currently still monstrous for no apparent reason.