Illustration Friday is a participatory art exhibit for illustrators of all skill levels. Designed to challenge participants creatively, it has become a welcoming community as well as a cultural phenomenon, with more than a thousand participants per week. New topics posted each Friday, plus artist interviews and creative forums, keep loyal visitors coming back for a fresh challenge. The site sits comfortably within Technorati's Top 1,000, with more than 3,500 links from more than 1,200 blogs.