A famous question now has an official answer.
Surprisingly, the Buenos Aires city government has provided us with very comprehensive website that allows you to select the type of information that you are seeking to find throughout the city, and navigate it accordingly. You search by neighborhood, and/or by the service or attraction you are looking for. Complete with maps, audio and downloadable media, we are actually impressed by the public offering, in English (for the most part)!
Check it out: Buenos Aires City Guide