I've rather belatedly got around to buying and reading The salmon of doubt (2002), an assortment of writings found on Douglas Adams's computer after his unfortunately early death in 2001. There are eleven chapters of an unfinished Dirk Gently novel and a considerable collection of short non-fiction articles on various subjects.
For anyone who likes Adams it's well worth reading. The extra fragments of Dirk Gently's life are sometimes funny, while the non-fiction articles are pleasantly readable and tell you more about Adams than you can get from his fiction.
I'm glad to have the book. But it's a pity he's dead. He wasn't very prolific, as authors go, but he was a memorable character and a nice guy. And only a couple of years older than me.
The world mostly thinks that his best work was The hitchhiker's guide to the galaxy. He thought his best work was Last chance to see, a non-fiction book about endangered species. I think his best work was Dirk Gently's holistic detective agency.