I've been using Quicksilver on my Macbook Pro for a while. This is a very nice utility for application launching and productivity in general. Recently I installed a Boot camp partitition with Vista, but I really consider removing Vista and return to XP because of performance issues. Vista is so slow to boot up and Exlorer just crashes randomly. But with my return to XP I'm going to miss some kind of application launcher. Vista got the Start Search feature which is kind of nice. I found two nice applications almost like Quicksilver that works great on Windows: Launchy and Colibri. Go check them out if you are using XP and don't like to manually search through your Start Menu for the application you need!