My impression of it is however that of mixed feelings.I found some simple queries working well, but some other totally wrong - with no indication why.
I tried some chemistry on it (having PhD in theoretical chemistry I could:-) ).
Simple molecules expressed via simple query like C2H5OH are superb, including nice 3D models (try), but when you take something more complicated but perfectly well known (like La2(CO3)3) it shows something that has almost nothing of any knowledge of value.
Moreover, when I typed an absurd formula H9O – the answer was unnoticeably similar to some other perfectly sound molecules !!!
I tried some concepts form neuroscience – I always got simple: “WolframAlpha isn’t sure what to do with your input.”
And what bothers me the most: that mysterious source reference: “WolframAlpha curated Data 2009” – with no real explanation what it is, how it was build etc…
As for the only real value I got from WolframAlpha - it did some funny deciphering of my first name: Mirek. Try it – it’s fun and you will understand my "aka" signature below :-)
Well, that was a joke – there are some areas in which it operates well. Almost all math formulas I entered were produced superb, nice plots, formulas etc. So, as Wolfram Mathematica web extension it is perfect. I’m not sure about other fields.
Perhaphs it is as David Winberger wrote: “WA is like roomful of idiot savants”
I hope it will improve. There is something in me, like a small voice, telling me: there is some huge value in Wolfram Alpha, though I still cannot see it clearly...
Mirek (aka 1K-1)