I carry my cell phone and my ipod nano around with me literally everywhere I go. Both of them require charging about every other day. I have been thinking about upgrading to a more expensive ipod with video capabilities. But if I do upgrade, I think I would feel really guilty about my contribution to the impending energy crises. I mean, is it sustainable for everyone in the world to carry around all of these personal electronic devices that make them more comfortable and stimulated and "connected" while they are walking around? Where is the limit to how much electronics people will carry? I am by no means an expert in the field, but I imagine that it is quite inefficient to carry a little television/min-computer/cell-phone/mp3 player with you as opposed to just using it while it is connected to a flowing power source. Does anyone have an idea of what the energy cost is of such portable electronic devices compared to non-mobile ones?