2008 marks the 30th anniversary of the Diagram Prize, the eagerly awaited contest to determine the oddest book title of the year, which readers of "The Bookseller" vote on, but whose fame has spread well beyond the book trade. Who could resist "People Who Don't Know They're Dead" or "Greek Rural Postmen & Their Cancellation Numbers"? One of those quirky humour books, jointly published with "The Bookseller", and there is to be a 'Diagram Of Diagrams' contest this year.