Sushi: Taste and Technique is Kimiko Barber's and Hiroki Takemura's guide to preparing, presenting and eating sushi. The book is thoroughly illustrated, and features photography by Ian O'Leary on nearly every page.
Sushi is thorough in every area. It gives a brief history of sushi, and information on the equipment and ingredients for sushi preparation. There are simple, easy-to-follow recipes on how to prepare sushi ingredients like omelets and soboro, and there is amazing coverage of the different fish, squid, octopi and oysters used for sushi, and how to cut and prepare each of them. The book also gives very detailed instructions on how to assemble scattered, stuffed, pressed, rolled, and hand-formed sushi. The book concludes with information on eating at a sushi bar, sushi etiquette, and other tidbits.
If you're looking for a book on sushi, it's hard to imagine one better than this.