The first book in the Potter series -- "Harry Potter and the Philosopher's Stone" (retitled "Harry Potter and the Sorcerer's Stone" in the United States) -- was an overnight bestseller.

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They were series opener Harry Potter and the Philosopher's Stone in 2001, fourth instalment Harry Potter and the Goblet of Fire in 2005 and the fifth entry, Harry Potter and the Order of the Phoenix, in 2007.

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K. Rowling's eagerly anticipated Pottermore website (www.pottermore.com) is a specially-created limited edition of Reader Wi-Fi (PRS-T1) which includes a voucher that enables Harry Potter fans to download the first Harry Potter eBook title, Harry Potter and the Philosopher's Stone, from Pottermore.

ENGADGET: Sony's new Reader Wi-Fi is the world's lightest 6-inch e-reader with multitouch screen (update: powered by Android)