Could you use Spotlight instead of Quicksilver?
“Keeping with the theme of using the software that comes with your Mac, I gave up using QuickSilver and other similar tools when Leopard came out. 10.5 made Spotlight much faster, and it now does 90% of what I was using third party launcher tools for.”
(Submitted by shauber)
I also use Spotlight as well, but QuickSilver is MUCH faster than Spotlight is normally.
minimalmac just posted a follow up article with some nice AppleScript commands to do things like Emptying the Trash, Ejecting Disk, etc.