EyeFly 3D is a (relatively) cheap screen protector for your smart phone, which, when applied, enables the viewer to see 3D effects on the screen without the need for glasses. A cool, simplistic, concept which will, in their words "transform your mobile device into your own portable 3D screen".
The product has had some trade press attention (MIT Technology Review, CNet Asia, Gizmag) and, as it bypasses what I reckon has been the main barrier to mainstream adoption of 3D (those damn glasses) it may just be a success.
The only barrier I can really see with this, is the lack of 3D mobile content available. EyeFly 3D have produced an app to "render content for viewing on your device" but this seems a little long-winded and has earned bad reviews. As well as existing 3D films, EyeFly 3D need innovative organisations to come up with original 3D content specifically for mobile and it's uncertain whether this will happen.
But, as they saying goes "build it and they will come"...
We shall see!