Come Monday, Sept. 19, fans of New York Times columnists Maureen Dowd, Paul Krugman, and David Brooks will have to break out their credit cards. Sept. 19 is the launch date of TimesSelect, a new subscription service designed to diversify the newspaper's revenue stream beyond traditional Web site advertising. The popular Op-Ed columnists are the main selling point behind the $49.95 a year subscription. (The service will be free for the paper's home delivery subscribers). The paper's news, features, editorials, and analysis will remain free, as will interactive graphics, multimedia, and video. TimesSelect subscribers will also have the ability to...