It looks interesting, though I don't think it would be as convenient as one would think.
Also, there is a glaring typo in the second paragraph of the description:
This very small black box blasts a red laser-made keyboard onto any flat surface and connects via Bluetooth to your PC, Mac, PDA, or Smartphone. If has a two-hour rechargeable battery.
Typing on certain table surfaces hurt my fingertips after a while. That's just me, though; not sure about the next guy.
Honestly, the virtual keyboard in the iPhone is not bad at all. I can punch out things pretty fast now, especially in widescreen. The error detection is really good.