kaled - 11:59 am on May 3, 2010 (gmt 0)
The trick with any user interface is to avoid creating a maze. If it looks pretty, great, but it must be easy to find what you want. Making a user interface appear and behave like the real world is unlikely to be efficient, but if it's done well may be an improvement over a standard Windows interface. The main advantage is that it should be intuitive to new computer users, however, the vast majority of users are no longer "new" so it seems unlikely this will change the world. Now, if a company with a large corporate client-base (maybe IBM) had bought it with the intention of pushing it into offices, perhaps it would have an impact.
There is an irony here - Google exists today because it provided a clean and simple interface to find things on the maze that is the internet.