Publishers Weekly (PW) reported this morning:
"Bookstore sales continued their perfect record in 2007 in May, falling for the fifth consecutive month. According to the U.S. Census Bureau, sales in May were down 4.3%, to $1.10 billion, and were off by the same percentage for the first five months of the year. Bookstore sales totalled $6.20 billion in the January through May period. For the entire retail segment, sales were up 5.6% in May and were ahead 4.1% for the first five months of 2007."
Shelf Awareness also reported on the Census Bureau numbers, but they added an important piece that PW didn't mention: "Under Census Bureau definitions, bookstore sales are of new books and do not include 'electronic home shopping, mail-order, or direct sale' or used book sales."