I just upgraded to the latest quicksilver (b56, off Google Code), and finally was able to install the clipboard module, which I learned about on a lifehacker post. The post mentions that you can activate the clipboard module by invoking quicksilver, then command-L.
Now, that's cool, but what I want to know is how would I have found this out if it wasn't written there? Is there a preference section where I can find this, or other keystrokes I might not know about?