With hundreds of exotically dressed people crammed into one of South Beach's hottest nightclubs, MTV Latino is launched. There's as much Spanish as English in the air and as many models as musicians. It's all part of MTV's image of youth and ease and scruffy good looks. Take Daisy Fuentes, she's a model turned MTV host who will anchor the new show in Miami as the master of ceremonies here tonight, she's got the kind of bubbly, bilingual enthusiasm that MTV Latino wants to project.