Perhaps my favorite Macintosh utility, Launchbar, is on sale at MacUpdate today for half off. If I were to be using a Windows or Linux machine, I think that Launchbar is what I would miss most. It is hard to explain how nice Launchbar is to someone who hasn’t used it and, indeed, it took me a while of using Quicksilver to really appreciate the usefulness of this kind of tool. My favorite features are the clipboard history at my fingertips and pulling up a contact’s information quickly. And I never ceased to be impressed by how quickly Launchbar seems to learn my preferences and anticipate what I most likely want to do. If you are using a Mac, check it out.