I'm usually just about the last person to catch on to super awesome internet things (I only JUST joined Twitter), and I am fairly certain that my recent awareness of Wooster Collective is the same story. If you don't know about Wooster Collective yet, it's a site dedicated to street art. Some of my favorites:
Seen on the streets of Hamburg
Fur coat upcycling
Photoshop adbusting in Berlin
"Today, after more than a year of planning, 2000 square meters of rooftops have been covered with photos of the eyes and faces of the women of Kibera. The material used is water resistant so that the photo itself will protect the fragile houses in the heavy rain season. The train that passes on this line through Kibera at least twice a day has also been covered with eyes from the women that live below it. With the eyes on the train, the bottom half of the their faces have be pasted on corrugated sheets on the slope that leads down from the tracks to the rooftops. The idea being that for the split second the train passes, their eyes will match their smiles and their faces will be complete."