I mentioned my examination Google's look at structured data some time ago. They have recently announced some improvements. Not much like WolframAlpha, but sort of a table extract search. A few quick looks shows far less in the way of nonsensical results, more useful results and sub categories. It is complete more often, but you cannot trust it to be complete. It only shows twenty US presidents, for example. You can now export the results to spreadsheet and CSV files, and sort them, which is useful.
We need something that bridges the world of structured vs unstructured data. That would require the inclusion of more semantic information about what we are searching for. WolframAlpha is one direction, though it still reaches beyond its grasp.