The paperback of Laurell K. Hamilton's Seduced by Moonlight debuts this week on the USA Today list, at #137.
Perhaps a result of holiday sales, the trade paperback of Audrey Niffenegger's The Time Traveler's Wife rose on several lists. It's still going strong after 34 weeks (not counting the earlier hardcover edition).
Among hardcovers, bestsellers by Philip Roth, Michael Crichton, Stephen King, Dean Koontz, and Susanna Clarke are still doing well. Longest is Christopher Paolini's Eragon, still selling in hardcover after 71 weeks.
J.K. Rowling's forthcoming Harry Potter and the Half-Blood Prince remains at #1 on all the Amazon lists.
(Bookmark this link, Locus Online Bestsellers, for automatic redirection to the latest week's chart.)