I love the fact that I’ve been using Quicksilver nearly since it was first released and I still keep finding new stuff it can do. Here’s a tip I found recently: you can assign quick keys in Quicksilver on a per-application basis.
I recently implemented John Gruber’s killer non-top posting applescripts for Apple Mail and also followed his advice to use FastScripts to override Mail’s default menu keys and run these scripts instead.
I just realized you can do this from within Quicksilver, alleviating the need for FastScripts. The secret is when you are creating a new quick key action in Quicksilver to switch to the Scope tab in the quick key settings: