JustLikeBeingThere.com, great high resolution photos of Argentina.
Black & White street photos, mostly of the San Telmo fair, very well done, taken by a former resident.
Clarin and La Nacion are the two big daily papers in Buenos Aires. Both websites are quite good (en espaņol, por supuesto)
Buenos Aires Herald, The English langugage newspaper. Very local in it's outlook. The articles have an amusingly British tone, as the paper largely serves the Anglo-Argentine community.
The Economist Survey of Argentina. From May 6, 2000. A good overview of the current economic and political state of the country.
Yahoo Full Coverage: Argentina
Destination Argentina. Lonely Planet's country overview. No specific travel information.
Lonely Planet Discussion Board: South America. A really good bugdet travel discussion board on South America, with frequent topics on Argentina/Buenos Aires.
Fodor's Buenos Aires "Mini-Guide". A lite version of their travel guide with some specific Buenos Aires info on places to stay and eat.
Finally, don't miss my epinion on the best empanadas in Buenos Aires.