This question was closed due to not having a wide enough audience. I personally think that it should be reopened, as many people do use Quicksilver. What are your thoughts?
I also think that question should be closed / deleted.
I don't see how the question as asked makes good use of this site.
Why not edit the wikipedia entry for that software to list the great plugins?
Once that was done, you could add it to the quicksilver tag wiki for more information on that software.
In the mean time, it's OK to ask really specific questions that show how awesome some plug-ins can be. Maybe try one or two questions and see if the answers are voted highly.
Don't rush to ask all manner of leading questions, but if there is one or two killer plug-ins that you can't do in Launchbar, why not ask and then later answer that question here on the site?
I agree with Nathan. Although Apple.SE is very relaxed regarding the list rule, making one for every application out there is simply overkill, and to be honest, will most likely chase regulars away that want to answer high quality questions and find lists a distraction.
FYI: This is what happened on SU and why we killed lists completely
As far as QuickSilver goes, it has been badly maintained and there has been great replacements out there like Alfred and LaunchBar, so do we know start a list for every one of these when there is already quite a few google-able resources out there that does have list of valuable plugins?
Do we really want to use list to get Google traffic which is simply just going to have users post questions to create more lists?
I am extremely anti-list and personally feel it's an abuse of the SE system and principles to allow them. I will therefore admit this answer is biased.