If you're looking to improve your karma, but don't know where to begin, look here.
The ideas here range from the heartfelt (Give a CD or tape to someone making a long car journey), to the funny (Compliment lesbians on their haircuts), to the crazy (Foil a robbery).
It has stories sent in from people with their ideas and experiences.
It's also written by Danny Wallace (Presenter of School's Out among other things)
Overall, this is a must have. Even if you just intend to keep it on the coffee table for guests to flick through.