too bad the spinoff project within google, Quick Search Box (same guy who started quick silver was involved), didn't really ever gain traction and has not been actively developed in a while, it had promise:
Actually the Quick Search Box maintainer (dmaclach) posted on Google Groups that Quick Search Box is basically dead in the water, and no longer funded by Google. Apparently most of the former team are now working on Chrome:
http://code.google.com/p/qsb-mac