As I was trying to kill time, I was researching Quicksilver extendability other than just quick-launching apps. Yes, I know Spotlight does it from the get-go.
My search led to a Lifehacker.com article (as usual, with this kind of things) written a while back about Gina Trapani’s Top 10 Quicksilver Plugins (at the time: November 2007). One of the plugins that intrigued me to check out was the Shelf module/plugin.