Marianne Williamson's bestseller Everyday Grace: Having Hope, Finding Forgiveness, and Making Miracles is touching a spiritual core in the marketplace, with sales doing very well at both the chains and independents. Riverhead launched the book in November with a national publicity and bookstore tour that began in the New York area with the Unity Church at Avery Fisher Hall-Lincoln Center and at Bookends in Ridgewood, N.J., and continued on in eight more cities. Highlights of Williamson's tour included an appearance on Oprah on November 18, where she officiated at a wedding, and the book's selection as one of Oprah's "Favorite Things" on her Nov. 25 show.