Quilting Stash is a podcast by Annie Smith. A few episodes back (#118 to be exact), she went over a list of every quilt fabric manufacturer she knows of that has a website. She talked a bit about each company, their designers, and any special features (clubs, patterns, etc.) offered online. A very good resource. You can listen to the podcast here; the fabric discussion starts around 7.5 minutes in. Or you can go right to the links from the blog entry.