Want to link to a newsgroup or mailing list post? Sure you can search for it in GMANE or Google Groups and then copy and paste the resulting URL. But here's a quicker way using Quicksilver courtesy of Florian Schulze a.k.a. "the guy currently sitting next to me at the PIKtipi sprint" (who also needs to get a blog of his own...)

First, make sure you have the "Websearch Module" installed:

Next, open this URL in Safari(!) and add it to your Bookmarks, giving it a name of, say, Google Groups MSGID Search.

Then, to search for the message reliably, copy its message id onto the clipboard by pressing Apple=Shift-U when viewing the message in Mail.app:

Now, simply invoke Quicksilver, type the keys necessary to invoke the bookmark you created (in my case typing GGR does the trick):

press tab twice, paste the id and hit return - voila... you will be taken to the page with the message: