It's not your grandmother's quilt world anymore. Quilting today is a phenomenally popular hobby, artform, and business, often rolled into one, that attracts 21 million avid quilters who spend $2.27 billion annually on their passion. There are 2,500 quilt shops around the country, popular television series, guilds, Web sites, and national fairs--one in Houston draws 50,000 visitors each year. Meg Cox, a former reporter for The Wall Street Journal ,...