Multimedia technologies (such as Flash and QuickTime) have been widely used in online product presentation and promotion to portray products in a dynamic way. The continuous visual stimuli and associated sound effects provide vivid and interesting product presentations; hence, they engage online customers in examining products. Meanwhile, recent research has indicated that online shoppers want detailed and relevant product information and explanations [2]. A promising approach is to embed rich product information and explanations into multimedia-enhanced product demonstrations. This approach is called Multimedia-based Product Annotation (MPA), a product presentation in which customers can retrieve embedded product information in a multimedia context.