Engadget
Before the Surface, Microsoft was working on the Courier.
The most disappointing device launches are the ones that have the most hype and then never happen.
There's a term for such devices: they're called "vaporware."
From wireless controllers on game consoles in the 1980s to phones with built-in projectors, there have been some amazing devices shown off by companies that have never made it into the hands of consumers.
Many of these devices were merely ahead of their time. As technology has caught up with their underlying concepts, new takes are hitting the market and finding success.