The whole time I lived in Buenos Aires, I was always looking for maps of it online. It's such a map-able city... that never ending grid with numbered blocks and streets that stretch from the centre to the suburbs, you always know how far you're headed based on the 'altura' of a street (and better check carefully as it could be the difference between a 5min walk and a 1 hour drive).
Well finally someone has done something about it. An expat in fact. Once you get used to Google Maps it's hard to live in a city without them, so this fusion of Live Search Maps, geocoding and GuiaOleo is just what we need.
It's got lots of useful shortcuts too - I selected Spas and here we have them - I knew I lived in Recoleta for a good reason...www.mapabsas.com