N Space is a (I suspect), the best of Larry Nivens short stories. If you like your SF in short exiting chunks with no loose ends this is the one for you, although all the stories have the common factor of being set in Nivens future chronology. Each one leaves you with that wow feeling you experienced the moment the credits came up after star wars. Its pretty addictive stuff if only because each tale is about a 45 minute read and you can therefore bite into nivens space (N-Space), and chew, and then come back to it without being let down. My favourites were "the fourth proffession" and the "balck line". Bear in mind i read this book 5 years ago, instantly gave it to a friend to read, and would not buy it agian because I remember every single story.
It realy is a great book. The only thing I would say is that he seems to like novels more than short stories, so its a bit like "Lord of the rings" in terms of finding something else to read after you have become fully addicted.