I want to put in a plug for a great mystery discussion group hosted on Yahoo groups. It's called 4MA - short for "For Mystery Addicts" - and it features discussions of just about every type and genre of mystery/crime fiction. It's a large group with people representing a wide range of viewpoints and all levels of mystery knowledge.
One of the regular features at 4MA is the more-or-less formal book discussions held each month, where particular books are the subject of discussion for several days at a time, with a moderator to pose questions. This week, I am pleased (he said modestly) to be leading a discussion of Agatha Christie's "Cards on the Table," which is the subject of this week's podcast here. Why not visit the 4MA group, spend some time looking around and join in the conversation? I promise, you'll be very welcome there.