So, the closest thing (ever) to Quicksilver is finally out, and looks to have a bright future. Sadly, I’ve had so many tussles with the Google Updater (which operates in stealth mode and, incomprehensibly, cannot update stuff if you’re not an admin user - i.e., it’s poorly designed and doesn’t prompt you for admin privileges) that after several tries to reassert ownership of my machine I’ve instead gotten used to invoking apps via Spotlight on all of my Macs.