Extensions seemed to be a subject of particular interest at this month's user group meeting, so I thought I'd point out a new article that introduces you to building CF Builder extensions. "Building Extensions for Adobe ColdFusion Builder" is an article by Simon Free on Adobe's DevNet which walks you through the basics of an extension and, more specifically, how the IDE_config.xml is core to CF Builder extensions. There's coverage of UI elements and "wizards" within your extensions as well.