I bought a new Macbook with Snow Leopard on it for the family and decided Spotlight was usable enough. My kids didn't agree, and begged me to install Quicksilve

I bought a new Macbook with Snow Leopard on it for the family and decided Spotlight was usable enough. My kids didn't agree, and begged me to install Quicksilver. It's easy to use, totally functional, and has even been updated to work on Snow Leopard. How is it "mostly dead"?