"Delicious," "luscious" and "irresistible" -- not words of praise for the latest trendy eatery, but just a few of the critical huzzahs that greeted the 1996 hardcover publication of Frances Mayes's memoir, Under the Tuscan Sun: At Home in Italy. Now Broadway Books' trade paperback edition marks its one-year anniversary on our list, with 740,000 copies in print after 26 printings. And there's more: coming in April as a Broadway hardcover is Bella Tuscany: The Sweet Life in Italy, a follow-up in which Mayes takes readers out and about not only in Tuscany but throughout her beloved Italy.