Thanks CGK. Here's a few more links of interest from my links page (includes this topic):
Ping Lists: Free Republic "Bump List" Register
http://www.freerepublic.com/focus/f-news/536123/posts
Ping Lists: List of Ping Lists and Their Keepers
http://www.freerepublic.com/focus/f-chat/1328605/posts
Ping Lists: List of Ping Lists and Their Keepers #2 (thanks Asphault)
http://www.freerepublic.com/focus/f-chat/1461671/posts
Ping Lists: List of Ping Lists and Their Keepers #3 (thanks cgk)
http://www.freerepublic.com/focus/f-news/1575959/posts
Ping Lists: Old Time Bump List
http://www.freerepublic.com/perl/bump-list
Ping Lists: Ping List Envy -- How big is your Ping List? (thanks PJ-Comix, and Farmfriend)
http://www.freerepublic.com/focus/f-chat/1278474/posts
Ping Lists: SeaMole's Concise List (thanks SeaMole!)
http://www.freerepublic.com/~seamole
Thank you! We should have this at the top of every thread of "updated ping lists" :D