Showcase is an interface for Quicksilver, the amazing application launcher from Blacktree. Showcase uses Leopard’s Core Animation to make a Cover Flow-like interface for Quicksilver. Just check out the video.
Sorry, no link since the author’s site is down. [local mirror]

Adam…
Check out (And embed if you like) my video on productivity with Quicksilver, you might learn some cool tricks, or if you’re more of a ninja, send them my way.
Someone recently sent me a blog comment that the Showcase, HUDBezel and Silverflow (Which is cool as well) plugins have disappeared. Not the case!.. I found the author, Julius Eckert’s website and his plugin’s are available.