The New York Times has the details:
Attorney General Alberto R. Gonzales, whose tenure has been marred by controversy and accusations of perjury before Congress, has resigned. A senior administration official said he would announce the decision later this morning in Washington.
Mr. Gonzales, who had rebuffed calls for his resignation, submitted his to President Bush by telephone on Friday, the official said. His decision was not immediately announced, the official added, until after the president invited him and his wife to lunch at his ranch near here.