Try out the same version I'm using and see if it works for you. Here
The process is slightly different than usual but the plugins work and it's pretty quick. He has a few appearances there that are nice but I'd stay away from Silverflow.
I'm not sure I see what you're talking about. The only QS things I see there are interfaces.
Look right after projects mentioning keyboardr and you see in bold Quicksilver Interfaces. Below that you'll see: You can grab the compatible QS version from: getqs.com
Oh yeah, that's the version I'm currently using. But development there has been abandoned by the original dev and open sourced, continued now here, but the page here seems mostly meant for developers.
If the current version works for you, don't bother to update. From what I understand Quicksilver will work in Snow Leopard with a fresh install of the app. While I would like to see things like QuickLook, it will probably never come. Quicksilver, unfortunately, will eventually break with a new OS so enjoy it while it's still around.
EDIT: If you're looking for things to work like emailing w/o opening the app, that's been broken for years and I'm guessing it won't come back.
If you interested you could alway use Launchbar but is not as full featured as Quicksilver.