These nifty items cut power to some devices automatically, while leaving others on. You plug a computer or audio/video receiver into a “master outlet,” and when the smart surge suppressor detects that it has entered a low-powered state like “sleep” or “off,” it cuts power to connected devices like printers, monitors, computer speakers, and DVD players. When the computer or A/V receiver is turned back on, it resumes power to all. Always-on devices like WiFi routers and cable boxes can be plugged into “always-on” outlets. Another benefit: You can keep the surge suppressor hidden, but still cut cutting power to certain components. Be sure you buy one designed for computers for your home office and one designed for home entertainment centers for your A/V gear, as the sensing levels used to shut off components may differ. Some of the better units come from manufacturers such as Monster Power (shown) and APC, which also makes a battery-backup UPS (Uninterruptible Power Supply) with controllable outlets. Investment level: Up to $100