The Illinois Institute for Continuing Legal Education (IICLE), publisher of those great practice guides, has a free article forum on its website. So far, it seems like most of the articles deal with law firm management, as opposed to trial practice, but the forum seeks general articles for posting. As explained by those in charge:
This section provides a forum for current and potential authors to submit materials that address either developing law or some other timely issue. If you have ideas for an article, please call me at 800/252-8062 or submit your proposed article to me at email@example.com. All articles should be unbiased commentary on the law that is timely or is a topic of interest to other practitioners in the Illinois legal community.