I would say that Google Search is only useful to the majority of people when it's searching across an index of the entire web. This scale is likely not achievab

I would say that Google Search is only useful to the majority of people when it's searching across an index of the entire web. This scale is likely not achievable at the desktop scale. On the other hand, the algorithm itself (though evolving) has been around for years. I view Google Search as a less complex algorithm over a larger set of data, while Watson is a more complex algorithm over a smaller set of data. (I've been known to be wrong ;-)