All I can say is 'it's different'. Wolfram said this morning that he is not seeking to compete with Google, about whom he spoke generously. Rather, his goal is to provide a fast interface to a wide range of computable data.

As an example of its quirkiness, 2 slices of swiss cheese + 1 leaf of lettuce + 1 quarter pound burger gives me a USDA style nutrition label. If I add bacon it says it doesn't know what I mean :-)