To date (August 2012) there are 39 main Discworld novels.
Sir Terry Pratchett is currently working on another two Discworld novels on this date.
There are also five short stories, four "mapps" (guides to Discworld locations), three "science of Discworld", two quiz books, one diary and ten miscellaneous Discworld books (such as encyclopaedias) by Sir Terry Pratchett.
So, to summarise, to this date, there are currently 39 main novels and 25 non-novels.
In total, there are 64 Discworld-related books by Sir Terry Pratchett, with two more currently being written.
Donna Jo Napoli has written 49 books total. That is how many are published...
Donna Leon is a famous writer and has published many books, some of her most popular books are The Jewels Of Paradise, The Golden Egg and Death in a Strange Country.
Her name is Donna Noble
Donna Noble.
Its Catherine Tate
Donna Jo Napoli is the author for many distinguished books for young readers. Among them are Crazy Jack, The Magic Circle, Zel, Beast, Sirena, Daughter of Venice, Bound, Stones in the Water, North, and many more. She has a Ph.D. in Romance Linguistics from Harvard University, though her books aren't romance based. She is an excellent author and I recommend her books.
Wilfred "Wilf" Mott.
Donna Leon is famous for being a best-selling American author known for her crime novels set in Venice and featuring the fictional character Commissario Guido Brunetti. Her books often focus on social issues and political corruption in Italy.
She first meets him in the 2006 Christmas special The Runaway Bride.
Donna's grandfather's name is Wilfred Mott. He is an amateur astronomer. As far as we know he is retired and he lives with his daughter.
A wedding dress.
His name is Wilfred Mott.