The New York Times is going gangbusters online.  The newspaper’s Web site on Tuesday announced a major expansion of its online business coverage, with a redesigned Technology section. It has also introduced an Economy section and Green Inc., a blog on energy and the environment. Other enhancements abound. The Times also announced the public beta launch of TimesPeople, an opt-in social network. Members of the TimesPeople network can share recommendations and comments and view public activities of other members. Members can also share ratings and reviews of movies, shows, restaurants and hotels.