Yahoo!’s first customized campaign breaks today in The New Yorker. The effort, by Yahoo!’s Idea Group, touts properties such as Yahoo! Personals and Yahoo! Search, and reflects the look and tone of the Condé Nast weekly’s “Goings On About Town” section. Ads running under the theater heading, for instance, carry copy such as, “Break a leg? Yahoo! Health.” Spending was undisclosed.