Charles Gibson is retiring and Diane Sawyer will replace him as the anchor of "World News."

Sawyer's elevation means that, with Katie Couric, two of the
three leading anchors for the broadcast networks will be women.
Gibson said he had been planning to retire at the end of 2007
but events compelled him to stay. He was named anchor following the
death of Peter Jennings and the wartime injury of Bob Woodruff.
He's been at ABC News for 35 years and says he plans to continue as
an occasional contributor.

Gibson took over the ratings lead shortly after he took over at
"World News." But he was eventually passed by NBC's Brian
Williams, who has led in the ratings for nearly a year.