You’ll be thrilled to find out about this site if you are a professional or dedicated quilter, as it is the home for the American Quilter’s Society, a membership-based association where you’ll be able to find information on trends, styles and project suggestions, plus a magazine on the topic and information on upcoming shows and expos; also interesting about this organization is that it supports a variety of educational programs and workshops, a full list of which can be explored in the site. You can visit this site in order to download state-of-art, ethnic or traditional quilting patterns, though note that access to them is restricted to members.
AmericanQuilter.com hosts an eCommerce area from where you can get specialized books, supplies and other quilt-related stuff. As is the case with many professional associations around, this site also carries a directory of quilters around the nation, and getting listed is free, plus you can get information on the Quilt Museum in Kentucky. 
