I was going to do another blog today, but this game called Machinarium distracted me.
It's a point-and-click adventure game - remember those? It's a pretty straightforward, logical sort of puzzle game, and there are plenty of hints if you need them, so you never really get stuck. The soundtrack is nice too. Sort of ambient, but really good. It's interesting, but never intrusive.
Recommendation: This game! I know it's not a book, but c'mon give me a break here. You can play the demo before deciding if it's worth forking over the US$20 for the full game. I thought it was and I wasn't disappointed.