Lifelong Californian Robert P. Laurence took a three-year walk in New York City, sharing his adventures with friends back home in more than 80 e-mail letters. Now he publishes those letters in an e-book, "Letters From Brooklyn: A Slightly Irregular Memoir of Everyday Life in New York City With a Tour Guide Thrown In," a witty, irreverent journal of his travels and everyday Gotham experiences. The result is a mosaic in words, a lively picture of all that is glorious and gritty in the greatest city in the world, an informal guide — complete with hyperlinks to attractions both major and minor — for anyone who might want to visit, anyone thinking about living there, or anyone who just wants to follow him for the ride.