Sorry, I don't know how to do a 'ping' list and consequently, I don't have one. If you want to start one, I'll alert you everytime I post something like this and then you can ping .
A ping list is just a semi-colon-separated list of freepers that you cut and paste into the "To:" box on a reply to a post. This results in those Freepers seeing "New posts to you" on their profile and they can then find the article you are "pinging" them to.
All it requires is your maintaining that semi-colon-separated list of freepers somewhere like in Word or in your email program.....