Discovery Channel's Planet Green recommends DssW Power Manager
Planet Green, Discovery Channel
Even in sleep mode, computers use up a lot of energy. But there are easy solutions—even easier than having an eco-button—for sending your computer into sleep mode more quickly to cut back on its energy consumption, or shutting it down altogether at a scheduled time so that phantom power is avoided. Jaymi Heimbuch, Planet Green, Discovery Channel
You can download and try Power Manager for free for thirty days.