Thanks to Stereogum for pointing us toward Blogotheque, a French blog that offers what it calls "Take Away Shows"--essentially, artists being filmed performing in the street or what have you. They've scored an impressive list of talent thus far, including Islands, Xiu Xiu and Grizzly Bear.
My favorite would have to be Au Revoir Simone. The trio performs "Stay Golden" while walking around in Williamsburg.