uh - quicksilver anyone? http://quicksilver.en.softonic.com/mac
http://docs.blacktree.com/quicksilver/what_is_quicksilver (alcor's site, who's now with Google and working on the QSB)
http://code.google.com/p/blacktree-alchemy/ (Google Code for QS)
I try to avoid the shareware download sites whenever possible; they're virtually useless these days and can be a breeding ground for adware. On the topic of the Google QSB, I'm going to give this a test run; I couldn't get used to Butler and I hosed my QS installation, so I've been looking for a good alternative.
One thing I've found frustrating with QS is that some of the functionality that worked in Tiger is no longer functional in Leopard.