A Day in the Life of MIT (ADITL) is a neat project in which members of the MIT community take pictures on a particular day and then pool the photographs together to provide a snapshot of what life was like on that day. ADITL 2010 happened yesterday, and hundreds of people contributed images to the collection.
Barcodes can be found everywhere, but using existing barcode systems with ordinary cameras require that the barodes be printed large or that the camera be placed close to the code. MIT's Bokode project is a new system that magically stuffs barcodes into bokeh, allowing ordinary cameras to be used as barcode readers from a distance. The codes are contained in little points of light that only turn into codes when viewed through an out-of-focus camera lens. You've probably seen how little bright points of light grow into larger and fainter points of light when you defocus.