Think "Avatar" meets "Dancing with the Stars." Taking a page from Hollywood, television manufacturers such as Sony and Samsung are now incorporating 3-D technology into new TV sets. What's so special about 3-D TV? When you watch a standard TV or even an HDTV, you're watching images transmitted in two dimensions, height and width. Three-D adds a third dimension -- depth. Some networks, including ESPN, are broadcasting some shows in 3-D. However, you need special glasses called active liquid crystal shutter glasses to view these shows. Why the glasses? Three-D images are actually two images of the same scene. The left eye sees one image; the right eye sees the other. The brain combines both pictures creating the illusion of a third dimension [source: Katzmaier]. Like all new products, 3-D TVs aren't cheap; some sets sell for $3,000 or more.