Now, to be complete, I must mention that WolframAlpha comes with some limitations – or should I say, it is still being developed – but may well become an interesting alternative to other search engines. Among the limitations, if for example you enter ‘taxol’ in the query bar, you obtain a very approximate structure of the molecule, with no mention of stereochemistry, although it is of prime importance for this type of molecules. It also seems that the notion of ‘buffer’ does not (yet) exist, even though a ‘buffer calculator’ would be quite useful…

So have a look at WolframAlpha if you need simple information (on chemistry or whatever else btw) and also have a look at their blog, reporting their latest innovations and ideas.