I have enjoyed practicing this short Chen Taijiquan form for the past eight years. It was developed by Grandmaster Chen Zhenglei.
Chen Taijiquan Short 18 Movement Form Webpage
List of Movements of the Chen Taijiquan 18 Movement Short Form
Chen Taijiquan Old Frame First Form Laojia Yilu Webpage
Chen Style Tai Chi Essential 18 Postures with Patrick Martin. Instructional DVD, 2 DVDs, 238 minutes. Disk 1, 130 Minutes. Jade Dragon Tai Chi International, Empty Circle Productions, 2008. VSCL. Patrick Martin is a student of Grandmaster Chen Zhenglei, and has been practicing and teaching Chen style Tai Chi for the last 20 years. Detailed instructions for each movement sequence. This DVD would be my first choice for an excellent instructional DVD on the Chen 18 Form.
Watch Grandmaster Chen Zhenglei perform the short form he created: