Hey, I recently found some cool high quality search engines ... there's more then google out there Check these : http://wolframalpha.com ( meta engines) just like http://clusty.com and http://zuula.com Hope this is usefull !
yes, there are more that google out there for sure but none comes close to the traffic and visibility (including revenue) that google offers. in other words, there is NO google alternative
Forget about it, even Yahoo is dying by not being able to search and render the results like Google does.
Wolfram is like a cross between Wikipedia, HAL-9000 and Google. No idea what it's effectiveness in terms of marketing and such would be. I find Bing is pretty good, less traffic but also lower PPC cost.