Paul S. Otellini is Intel’s fifth CEO in its 40-year history, and three of the other four — Robert Noyce, Gordon Moore and Andrew Grove — were among the most famous business leaders of the 20th century. Under their stewardship, Intel became the semiconductor industry’s dominant player, and perhaps the most important American company of the 1980s. Now, after looking slow and confused for much of this decade, Intel, under Mr. Otellini’s leadership, is again showing the competitive fire for which it was once famous.