Oprah Winfrey's spokeswoman said today that the talk-show host plans to end her long-running program in 2011. The loss of "The Oprah Winfrey Show" will be missed in particular by the book publishing industry.

“It’s a blow,” said Lorraine Shanley, a partner in the consulting firm Market Partners International Inc., who earlier this week watched former Alaska governor and Republican vice presidential candidate Sarah Palin promote her book on Ms. Winfrey’s show.

“Oprah...