This is agood source. However, it is from 2007 and does not include links to the ping list owners.
It DOES, however, have a very good sort by category list so it will be very helpful.
Got a lot of help just by this little thread, thanks to all.
FYI: cgk’s updated ping list from August 2008.
http://www.freerepublic.com/focus/news/1811878/posts?page=306#306