Tina Fey and Amy Poehler’s “Baby Mama” pulled in $18.3 million in its opening weekend at the box office, good for the top spot (in what’s sure to be the last sub-$20 million opening weekend for awhile). MP users turned in a near-perfect prediction for “Harold & Kumar Escape from Guantanamo,” which registered a $14.6 million debut. “Forbidden Kingdom” fell to third with $11.2 million, followed by “Forgetting Sarah Marshall” and “Nim’s Island.”

On the Billboard 200 the emancipation of Mimi continues, as Mariah Carey landed at No. 1. Leona Lewis, Miley Cyrus, and Lady Antebellum filled out the top five, while R.E.M. slid from fifth to ninth in only its third week out. Taylor Swift crept back in to the top 10 in her self-titled album’s 78th week on the charts.

It appears total domination of the network ratings just isn’t good enough for FOX. “American Idol” continues to crush the competition in the Nielsen ratings. Still, the network is performing online research to determine how the show might be improved.

Julie Andrews’ memoir “Home” is No. 2 on the NYT non-fiction list. It covers “from birth to being cast as Mary Poppins.” Fans of the book can expect a sequel in 2-3 years. Speaking of sequels, the 9th book in Alexander McCall Smith’s Ladies’ Detective Agency series enters the fiction list at #3.