Based on sales for the week ending May 1, 2011

16. Drive
Daniel H. Pink, Riverhead, $16, 9781594484803

17. Lunch in Paris
Elizabeth Bard, Back Bay, $13.99, 9780316042789

18. The Last Stand
Nathaniel Philbrick, Penguin, $18, 9780143119609

19. Packing for Mars
Mary Roach, Norton, $15.95, 9780393339918

20. The Dirty Life
Kristin Kimball, Scribner, $15, 9781416551614

21. Role Models
John Waters, FSG, $15, 9780374532864

22. Have a Little Faith
Mitch Albom, Hyperion, $13.99, 9781401310462

23. Paris, Paris
David Downie, Broadway, $15, 9780307886088

24. The 5 Love Languages
Gary Chapman, Northfield, $14.99, 9780802473158

25. The Four Agreements
Don Miguel Ruiz, Amber-Allen, $12.95, 9781878424310

26. Half the Sky
Nicholas D. Kristof, Sheryl WuDunn, Vintage, $15.95, 9780307387097

27. Aftershock
Robert B. Reich, Vintage, $14.95, 9780307476333

28. Eaarth
Bill McKibben, St. Martin's, $14.99, 9780312541194

29. Cracking the AP U.S. History Exam
Tom Meltzer, Jean Hofheimer Bennett, Princeton Review, $18.99, 9780375429910

30. Committed
Elizabeth Gilbert, Penguin, $16, 9780143118701

31. Parisians
Graham Robb, Norton, $17.95, 9780393339734

32. What to Expect When You're Expecting
Heidi Murkoff, Sharon Mazel, Workman, $14.95, 9780761148579

33. Three Cups of Tea
Greg Mortenson, David Oliver Relin, Penguin, $16, 9780143038252

34. Night
Elie Wiesel, FSG, $9.95, 9780374500016

35. Infinite City: A San Francisco Atlas
Rebecca Solnit, Sandow Birk (Illus.), University of California Press, $24.95, 9780520262508

36. Mennonite in a Little Black Dress
Rhoda Janzen, Holt, $14, 9780805092257

37. Crow Planet
Lyanda Lynn Haupt, Back Bay, $14.99, 9780316019118

38. The Devil in the White City
Erik Larson, Vintage, $15.95, 9780375725609

39. This Is Not the Story You Think It Is
Laura Munson, Berkley, $15, 9780425238998

40. Food Rules
Michael Pollan, Penguin, $11, 9780143116387

41. The Lost Cyclist
unknown, Mariner, $14.95, 9780547521985

42. NurtureShock
Po Bronson, Ashley Merryman, Twelve, $14.99, 9780446504133

43. Eat, Pray, Love
Elizabeth Gilbert, Penguin, $16, 9780143118428

44. Dead End Gene Pool
Wendy Burden, Gotham, $16, 9781592406067

45. Women Food and God
Geneen Roth, Scribner, $15, 9781416543084

46. The CalorieKing Calorie, Fat & Carbohydrate Counter 2011
Allan Borushek, Family Health, $8.99, 9781930448339

47. The River of Doubt
Candice Millard, Broadway, $15, 9780767913737

48. The Power of Now
Eckhart Tolle, New World, $14, 9781577314806

49. Awkward Family Photos
Mike Bender, Doug Chernack, Three Rivers, $15, 9780307592293

50. Dance First. Think Later.
Kathryn Petras, Ross Petras, Workman, $8.95, 9780761161707