Nightingale-Conant - Personal development audio books. Dick Summer - Audio books, focusing on relaxation, motivation, and relationships, in tape and CD formats. Effective Learning Systems - Self help audio cassettes and CDs. Achieving Excellence - A wide selection of audiotapes, videotapes and books on personal development topics. MindPerk, Inc. - Specializing in self-improvement audio books, downloads, and videos. Topics include self esteem, sales training, and mind development. Learning Strategies Corporation - Offering a variety of products on self-help, personal development, and health.