Update: The reader comments on this item were shut off this afternoon. The volume of off-topic posts and personal attacks - on all sides of the discussion - were out of hand, and a number of accounts were disabled.

From David Hulen in Anchorage --

There's a new biography of the governor out tomorrow: "Trailblazer: An Intimate Biography of Sarah Palin" by People magazine assistant editor Lorenzo Benet. The blurb from the publisher (Simon & Schuster) says it's "the intimate portrait of Sarah Palin that America has been looking for."

People reports today that "Benet received the cooperation of Palin's parents, Chuck and Sally Heath; the governor's older sister, Heather Bruce; as well as in-laws, political allies and rivals." The book wasn't authorized by Palin herself, the magazine says. From the People piece:

A new biography of Alaska Gov. Sarah Palin reveals that her secret pregnancy with son Trig was nearly uncovered when one of her daughters discovered Trig's prenatal ultrasound scan and confronted Palin with the picture...

Palin also was aware Trig had been diagnosed with Down syndrome but did not disclose this to her four other children until his Trig's birth last April 18, several weeks after she went public with her pregnancy.

"Not discussing the pregnancy with her daughters, she felt, would shorten the process and spare them from unwanted attention," according to the book...

The first chapter is on the Simon & Schuster Web site.