Orson Scott Card's Shadow of the Giant emerges as the hardcover on the most lists currently, debuting this week on the Washington Post list and remaining on 3 others. Previous leader State of Fear by Michael Crichton drops off 2 lists this week, to remain on only 2 others. (In paperback, Audrey Niffenegger's The Time Traveler's Wife remains on 5 lists.)
Matthew Stover's Star Wars novelization Revenge of the Sith, remains on 2 Amazon lists with pre-publication orders.
Mysteriously, Haruki Murakami's Kafka on the Shore, which ranked #1 on San Francisco's hardcover fiction list each of the past 3 weeks, disappears from the list entirely this week.
J.K. Rowling's forthcoming Harry Potter and the Half-Blood Prince ranks #1 on the all Amazon lists.
(Bookmark this link, Locus Online Bestsellers, for automatic redirection to the latest week's chart.)