Hilton Corporation,which during 2006 reported $7 billion in annual sales from 2,800 properties supplying about 500,00 rooms. The even-bigger Marriott Corporation grew from root-beer stands operated by J. Willard Marriott and his wife in the late 1920s in the area in and around Washington,DC,into the Hot Shoppe restaurant chain and eventually,by 1957,into hotels. In 2006,the current,Marriott International had annual sales of $12 billion while owning,operating managing,and