The One Laptop Per Child (OLPC) initiative represents the cutting, if not controversial, edge of green e-device design. The Association for Computing Machinery (ACM) has published an interview with OLPC's CTO Mary Lou Jepsen, which is a insightful must-read for anyone interested is sustainable e-device design. The interview covers a host of design decisions surrounding OLPC's XO laptop (an EPEAT gold device), including power consumption and management, display and networking technologies, RoHS, and lifecycle planning.

Update 2009.12.29:
Here is a talk by Jepsen, now with Pixel Qi, on related topics, including low power displays.