Lugerforum in Greatest Handguns.
 

This forum was mentioned in a book I am reading, Massad Ayoob's Greatest Handguns of the World, page 150 on the chapter about the Luger it says, "through today's excellent resource on the Internet, www.lugerforum.com"

From our book 'The Parabellum Is Back! 1945-2000' :)

Acknowledgments
This book is the result of several years of research that could not be completed without the help of friends and collectors sharing our passion. We will probably forget to mention a host of contributors, for which we offer our sincere apologies. A special thanks to John Dunkle and Jan C. Still for their excellent Luger forums which have helped to speed up so many research projects by providing an internet platform for the exchange of contacts and ideas. Also to their moderators, Edward Tinker and John Sabato, and, of course, to all regular contributors of both forums.

Worse still, we really mean it :D