Food blogs, message boards, and Twitter pages have made restaurant reviews a more democratic process. Each person with access to a computer becomes an Internet Craig Claiborne. Depending on whom one talks to in the restaurant biz, this occurrence has either strengthened restaurants or severely crippled them. But before Chowhounders and social networking groups, there was the Zagat Guide. For over 30 years, Tim and Nina Zagat have carefully edited thousands of co...