Have you heard of the Escape Artist website?
Escape Artist is a really cool site about living or traveling around the world. They have newsletters or magazines that are free to subscribe to, the June 2007 issue included this great article on Buenos Aires by Virgina Brumby.
Although the article makes the familiar and unoriginal comparison that Buenos Aires is the Paris of South America, it does cover several interesting topics too. Brumby starts out with an interesting history of Buenos Aires before telling us about her time in San Telmo, Palermo's parks, and Palermo.