Spencer Johnson's "Who Moved My Cheese?" has changed the way the world looks at change. With well over 6 million hardcover copies sold in the United States and more than 12 million copies sold in thirty-seven countries, "Who Moved My Cheese? continues to make a big difference in countless lives. Special promotions, advertising, and publicity throughout 2003 tied in to the fifth anniversary of "Who Moved My Cheese? will bring this perennial bestseller to an even wider audience. For, as "People magazine writes, the appeal of this extraordinary book "knows no bounds."