MIAMI — MTV Latino and Nickelodeon Latin America have launched MTVNick.com, a joint Web site for affiliate multisystem operators and the press.Site will be updated constantly with info on programming skeds, marketing, contests, news, technical data, show graphics, logos and research data. Affil sales are handled by MTV Networks Latin America. MTV Latino covers Spanish-speaking markets only, with more than 10 million subscribers. Brazil MTV is a separate operation. Nickelodeon Latin America is available to MSOs with Spanish, English or Portuguese audio. It has 9.6 million subs in the region.