How can I link to a thread, or - if not possible - a post on this mailing list?

Let's say I am looking at an interesting mail I'd like to reference to in a web page.
I ask my user agent to display all e-mail headers.
What header should I pick, and to what web service should I feed it to obtain a permalink?

I know I can go looking at biglist, trying to locate the mail and linking it thus, but I was wondering if there was a more direct way.

There is no more direct way that I know of.  I will look into what it
would take to provide this capability, but make no promises.