BAIN - Buenos Aires International Newcomers offers friendship and support to those new to the city. Included are two chapters, a northern suburbs one and a downtown one.
BA Expats - a number of forums like this one exist, where Gringos can post questions and suggestions, and hopefully find some answers.
Discover BA - provides useful info for expats in BA, including historical and current information on life in BA, for expats, written from the perspective of a New Yorker who moved to the city, then married and had kids here.
Gringo in BA - offers a more "authentic" focus, for those Gringos interested in living more likes Portenos! Also includes some great historical posts about Tango and more.
The Buenos Aires Herald - Local News (including the blue rate for pesos/USD), online, in English!
Mapa Buenos Aires - an interactive map that allows you to input your starting and ending points, and will tell you which bus(es) and subways to take.