The Fine Books Blog publishes an annual round-up of the highest prices paid last year for books, maps, and autographs at auction. They publish their full list in their March/April issue.
Their post from December 2007 gives a sneak peak at the top 10, which includes a copy of J. K. Rowling, The Tales of Beedle the Bard. 2007 in the number two spot which sold for $4 million. It was one of seven copies of a handmade book related to the Harry Potter stories, which was sold to raise money for charity and purchased by Amazon.com.
The number one spot was a copy of The Magna Carta, dated 1297, which sold for $21 million. It was the only copy in private hands of this foundation document of Anglo-American law and freedom, and was sold by H. Ross Perot and bought by a private equity fund.