I have for a while been searching for a really good BA website that has all the shit that goes on in this monstrous city. The best, up to now was WhatsUpBuenosAires run by Mr ZZK Grant Dull n Co. However, Proyecto Under seems to have it's finger on some kind of pulse. I am a little pissed off I only discovered it now, though not sure how long it has been going.
Not only covers BA but also Córdoba, La Plata n Santa Fé. Also has reviews, classifieds, news, playlists, viedo, agenda, all sorts of loveliness. A bit rough round certain edges but I like.