The Nokia Eco Sensor is essentially a device that consists of a "wearable mobile phone with giant display and a remote sensing unit which keeps tabs on your health and external environment." No word yet on if this concept will go into production. Click here for first picture in gallery.
Nokia research envisions that the sensor unit would be worn on a wrist or neck strap made of solar cells. It would then communicate back to your phone via near field communications (NFC) or RFID. What you monitor (i.e., the sensors you get) will be customizable based on user preference[via Engadget]