You know, selling your art to put on napkins, tissue boxes, bedsheets or greeting cards. Then you have to check out this blog: joanbeiriger.blogspot.com . It’s a whole new world, where trends are important and some products are on shelves for less than a week! I’m not sure all advice works for illustrators and fantasy artists (I don’t think that if you license a dragon to use on a dice bag, it has to match with the latest colors used by Martha Stewart.) On the other hand, this article on query letters is right on the money, just replace manufacturer with publisher and you have great advise.