If further evidence is needed of Oprah Winfrey's bookselling clout (duh), we offer the case of The Dark Side of the Light Chasers: Reclaiming Your Power, Creativity, Brilliance, and Dreams. This Riverhead trade paperback (copies in print: 600,000+), published in June 1999, debuted on our list last November 20 following author Debbie Ford's October 30 full hour with you-know-who. Two more Oprah appearances—November 6 and 20—kept the book on the list through the end of last year. The Ford programs were re-aired earlier this year and The Dark Side jumped back onto our weekly lists. (Of course, Ford's April 6 spot on Good Morning America didn't hurt.) In addition, USA Today ran a story in February about Ford and her sister, Arielle, who's an agent, publicist and author (her latest, Hot Chocolate for the Mystical Lover, was published by Plume in January).

With reporting by Dick Donahue.