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I used to be a quicksilver user, I now use this http://www.google.com/quicksearchbox/ basically the same idea.

Actually, the main developer of QSB is also the creator of Quicksilver, whom made it an open source project once Google hired him.

That's why Quicksilver has no official site, by the way.

Yeah I tried it, but it's not as featureful as quicksilver, still. Maybe once it matures a bit.