It looks like Potter mania is going to hit UK again this summer.
"Britain's Royal Mail is issuing a series of seven stamps depicting the covers of the best-selling "Harry Potter" books just before the final volume goes on sale.
Millions of the stamps will be issued on July 17 as part of the post office's tradition of celebrating "social themes and important occasions central to our way of life," said Julietta Edgar, who is in charge of special stamps at Royal Mail.
"Harry Potter and the Deathly Hallows" goes on sale July 21.
I also found this interesting article from the Economic Times of India, and although it is a bit old, the ideas are fascinating.
It looks at the globalisation and marketing of HP, and is well worth a look.