I did a quick (unscientific) scan of the topics posted in all the forums. A pattern of repeat topics emerges--mostly posted by newbies (we all were, once), and giving a feel for what really gets into Trilogy and Mafia fans' blood.

Without question, the most oft-posted topic is: "Who shot the Tahoe gunmen?" Some of the other faves, in no particular order:

--Did Roth plan for the cop to foil Frankie's murder?
--What does "ba fan gool" mean?
--Who is that ghostly image at the Don's burial?
--Who did Clemenza kill in the elevator?
--What are the Mafia ranks?
--Did Connie know that Michael had Fredo killed?
--Who was a better Don: Vito or Michael?
--Did Fredo know he was going to be killed?
--Did Rocco know he was going to be killed?
--Why was Tom out?
--How do I join the Mafia?
--What should I visit when I visit New York City?
--Where can I buy the DVD Trilogy set cheap?

I know some here (many?) are annoyed that these familiar questions get asked time and time again. And those who advise new people to use the "search" function to find the answers are right to do so. But I don't mind these questions being repeated, because every so often someone comes up with a new and interesting interpretation.