Duke's Milly Watt Project: Mobile computing is dramatically changing our day-to-day lives, especially with the popularity of small, battery-powered devices. Reducing the energy consumed in using these devices, thereby extending the lifetime of the batteries that power them (and reducing the weight of carrying spares), is one of the major challenges in designing such systems. This problem can be addressed at various levels of system design. The Milly Watt Project focuses on solutions at higher levels -- from the architecture up to the applications. This talk will survey some of the activities and accomplishments of our project.