... and the Diagram of Diagrams, i.e. the award for the oddest title ever (or at least in the last 30 years) goes to:
Greek Rural Postmen and their Cancellation Numbers.
published by the Greek Hellenic Philatelic Society of Great Britain, which "exists to encourage the collection of Greek stamps and to promote their study".
In celebration, the Guardian has put up a gallery of 30 odd titles.
Glad to see none of my weird books was picked. It's always a question of perspective, I guess. Most of the authors concerned probably considered their title perfectly reasonable.