The links below will help you start your exploration of Buenos Aires, known locally as Capital Federal, or just Capital (the restaurants, bars, theatres, ...are nearly endless):
Guía Óleo - Restaurant Guide
Time Out Buenos Aires
BA4U - Apartment Rentals
Village Cines - Movies
Cinemark - Movies
BAIN Downtown - Buenos Aires International Newcomers
BAEXPATS - Buenos Aires Expatriates Group