ReadWriteWeb covers the release/beta of the WolframAlpha Computational Search Engine here:  http://www.readwriteweb.com/archives/wolframalpha_our_first_impressions.php.

I agree with them that this isn't a Google killer (and unless Google REALLY screws up, nothing is out there that could challenge them); however, their focus on enhancing results with automatically generated charts and graphs, as well as other features should be interesting. Of additional interest will be how they'll make any money off this venture. 

WolframAlpha launches in May.