And avid young Potter fans can rest easy: JK Rowling has started work on the sixth book in the saga set in Hogwarts School of Witchcraft and Wizardry.
   
Rowling's agent, Christopher Little, said on Monday worldwide sales of the first five books have now reached 250 million.

They have been sold in more than 200 countries and translated into 60 languages, ranging from Gujarati to Ancient Greek. The latest, launched in India this month, was in Hindi.

The publishing industry has hailed Rowling's success in teaching the world's children to read again in an age of short attention spans fed a diet of TV, cartoons and computer games.

Revolution

“JK Rowling's books have paved the way for a new generation of exciting children's writers, causing a revolution in children's enthusiasm for reading,” said Little.

“We look forward to introducing Harry Potter to yet more readers in the furthest parts of the globe," he added.

Actor Daniel Radcliffe (R) stars as
Harry Potter

Nor is Rowling resting on her laurels.

“JK Rowling has begun work on the sixth book about the boy wizard. As yet no date is fixed for its release," he said.

The release in June of the fifth book, Harry Potter and the Order of the Phoenix, was billed as the world's biggest book launch with kids from New York to Sydney devouring the volume.

Money-maker

On day one, 1.78 million copies were sold in Britain alone, helping to push the first-half profits of Bloomsbury Publishing Plc up by 14%.

Rowling, once a single mother who penned her books in an Edinburgh cafe, is now a multi-millionaire who has been ranked as the world's best paid author.

The Sunday Times put her earnings over the past year at £125 million ($211 million), which was calculated as being the equivalent to £388 for every word of her latest Potter saga.

“She is a money-making machine. The temptation to keep writing after the last of her seven planned Potter adventures must be irresistible. She could be the first billionaire author in history," said Philip Beresford, who compiled the Sunday Times pay list.