PC's use energy (would be great if they would create it ;-)). But can you cut down on energy consumption, make computers consume less? Can you save money doing that? Energy aware people will find practical info on energy efficient computers in this Infoworld article 'Seven green products that can save you dough'. Don't stop reading at the 'data center cooling spray', but (also) read about the green Earth-PC, about Surveyor that let's you measure and manage energy (policies) on networked PC's and upcoming battery and screen technology.