Dubravko Gacina have sent a link to his project that was participating i a circuit cellar MSP430 design contests some time ago.
This is a digital temperature and humidity metter based on MSP430F413 microcontroller. MSP430 microcontrollers are known as ultra low power MCU devices that are ideal for battery operated devices. Sadly that there is no more information including circuit and firmware. Also you can go through other projects that took place in design contest like Tiny Guidance Engine, Automatic Blood Pressure Meter • Tennis Computer and other projects based on MSP430 microcontrollers. You might find some great ideas for your own design.