Constant Content is another place where you can sell such things. (I was about to tell you about it last night when we started talking about Associated Content, but then the site was down.) Except the way Constant Content works is that you have to put your articles up for sale, and then they're available for anyone who wants web content to come and buy them. I haven't sold anything through them, but I've just got a couple of things posted and I've never written in response to any of the requested topics. Just another place to consider.