The best searching tool I had ever seen on the market was called Webferret. It even had its own little suite for searches on people, numbers, files, web sites..etc... Each of these was its own ferret tool. However, they got bought out and now only have the Web searching tool which sucks and has spyware is is overall not the same anymore.
Such a shame because when it started it was able to find unlisted numbers and cell phones. I have yet to see a proggy of equal or better search scheme.