Splash screens annoy me, so I tried to disable the one in Quicksilver using its preferences. But there is no option there to do so. Then I came up with a simple solution to remove it -- and this should work on other programs with splash screens you'd like to remove. Here we go:

1. Quit Quicksilver.
2. Navigate to where your Quicksilver application is (normally the Applications folder).
3. Control-click on Quicksilver and choose Show Package Contents from the pop-up menu.
4. Go to Contents » Resources and trash (or rename) the QSLigature.png file
5. Relaunch Quicksilver.

No more splash screen! These steps are related to the version 3813, but should work on older versions as well. Make sure to duplicate Quicksilver before following thsese steps just in case anything goes wrong -- or you could just download it again.