This is really interesting on many fronts... Google queries are trivial and dumb - they take virtually no CPU power to execute (on a per-query basis) in the grand scheme of things. But I'm trying to imagine how Wolfram Alpha will scale, and I'm not really seeing it. You can't precache results, queries require the aggregation and manipulation of huge data streams, and so on and so forth.

Wolfram Alpha is going to be _expensive_ to keep up. It's good to see they've already thought of this (with their Pro offerings), but the thought of the sort of power this thing would consume if it becomes popular en masse makes me shudder.