Thanks for the replies, guys.
Back in my PC days (2 months ago) i used Sonar, and it would let you add options to it's 'Tools' menu as I recall. I would use it to launch a librarian for my Korg and Yamaha patches.
Having the option in Sonar's Tools menu kept things in context when I was composing/mixing/whatever.
For Quicksilver, I understand you have to search for the app each time and then select it to launch like spotlight ? Do I have that right? I would rather just hit 2 keys and go..