Viva Tango is a great place to learn Argentine Tango and meet cool tango lovers. We meet for a lesson and milo/parctica (this is a made up word to combine milonga and practica).
Here is an example for a demo of what we learned on Thursday, December 1st, 2011, by Vittoria and Guillermo (http://www.youtube.com/watch?v=PXMUkbkVpCE)
