Reuters has
announced that US fans bought more copies of '
Half-Blood Prince' on its first day of release than any other book sold in the country in the whole of 2005.
"According to industry sales tracker Nielsen BookScan, J.K. Rowling's latest book on the boy wizard, "Harry Potter and the Half-Blood Prince," sold 4.1 million copies in the United States on day one and 7.02 million copies for the full year."
The full list of top ten US 2005 best-sellers can be found
here.