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Using a network of smartphones mounted on car dashboards to help avoid stopping, SignalGuru can keep drivers from idling, the most fuel consuming--and frustrating--part of driving. Traffic lights are a necessary nuisance, but they're also incredibly bad for the environment. Idling vehicles in backed up traffic soak up fuel, and are a source of needless emissions

1. Late yesterday Facebook revealed a surprisingly green core to its computer operation--efficient server and infrastructure designs that consume less energy than comparable data centers, and are 38% more energy efficient and 24% more cost effective than its previous configuration. Better yet, for the ecologically minded, Facebook is making the design of its infrastructure open source to encourage other folks to use it--it's called the Open Compute Project