The AppleBlog has put together an excellent list of Quicksilver Tutorials 
from a variety of sources.
You will find tips on creating and using triggers, tagging files with Spotlight comments, and tutorials from Dan Dickinson aimed at people just starting out with Quicksilver .
Readers of Hawk Wings will probably want to add Merlin Mann’s tutorial on sending short emails with Quicksilver and a tip on using Quicksilver to email a file to the list.
I’ve been trying to figure out with quick silver how to send emails to groups. Anytime I use Send Directly or any other mail action I can’t use a group. Any thoughts out there?
My understanding is that it cannot be done, although I would be very happy to be corrected.