This is something I found interesting from the November 2009 edition of Discover:

The Swedish company Polar Rose has developed software that identifies unlabeled individuals in digital photos, such as those posted all over Facebook, using face-recognition algorithms.  Once you tag a friend in one photo, the software will automatically identify when that friend appears in other photos …

Medical advances may cause our data clouds to envelop us in new and unexpected ways.  Harvard synthetic biologist Yaakov Benenson is developing implantable computers capable of detecting chemical changes inside a cell.  Eventually, such devices should enable us to monitor our vital statistics, take diagnostic tests, and receive treatment without ever going to the hospital.  The results could be beamed wirelessly to health-care providers, raising the specter of eavesdropping.