I work in the Socio-Digital Systems group, which is part of Computer Mediated Living (CML). One of our peer groups in CML is the Sensors and Devices (SenDev) group, which is the home for SenseCam, a project that has had a lot of attention since its inception quite a few years ago.
SenseCam is a wearable digital camera that records all the time. It captures fisheye images as well as some sensor data such as ambient light and acceleration/deceleration. It has a whole bunch of potential applications including helping alleviate memory loss or building up an archive of a persons whole life.
The SenDev group have put together a great web site that summarizes the project, and work associated with it, for those who are interested in more detail.