I've been giving TinMan Games Gamebook Adventures Engine a go on my new Nexus7. I've been playing their own Gun Dogs, illustrated by Gary Chalk, and the Fighting Fantasy classic Forest of Doom.
I'm a massive fan of gamebooks, partly for nostalgic reasons. Forest of Doom thought reveals the rather basic underpinnings of the system in the newer, faster playing format. While Gun Dogs has a rather Groundhog Day effect where the difficulty rather radically spikes and you are left to play the opening stages again and again to figure out how you are meant to build your character up enough to survive the combat.