I recently learned of two resources for developers looking to improve their ColdFusion skills:
Webucator (http://www.webucator.com) - Webucator provides customized onsite ColdFusion training an At-Your-Own-Pace online ColdFusion courses.
LearnByHeart (http://www.learnbyheart.com) - LearnByHeart is a Web-based service that helps developers pass Macromedia certification exams by practicing on sample exams.