Is there a How To Do A Ping List Ping List?
No, but they're easy.
Announce one.
Start collecting names from people who want to join. (Or you can just inherit a list from someone who wants to give one up.)
Make a cute little thingie to post to announce your list, like wagglebee or I have for our lists.
Whenever you find a thread relevant to the topic of the ping list, copy and paste the names on the list into the To: field just like when you ping one person.
Post.