Tunesque: A Better Search for the iTunes Store
Built by Marco Tabini, Tunesque takes a Spotlight approach to searching the App Store and Mac App Store. It can display app previews and descriptions, its interface is customizable, and naturally has a handful of keyboard shortcuts.
The app is completely free, and Marco only gets paid via Apple’s no-cost-to-you affiliate commission service (the same one I use on this site) when you purchase something. Clever.