There's a make of charger called Xqisit which switches off when you remove the phone from the cradle. A brilliantly simple idea that will save the energy wasted when chargers are left plugged into the mains. I hope power supplies more generally can follow this lead.
The system works by a simple switch. Here's a Nokia compatible model:
http://www.mobilefun.co.uk/product/16651.htm
and here's a Sony Ericsson:
http://www.mobilefun.co.uk/product/16659.htm
While I was searching for this I discovered that "After the Chinese government recently mandated micro-USB as the future national standard for mobile phone chargers, OMTP (the Open Mobile Terminal Platform), the forum whose members include Nokia, Samsung, Motorola, Sony Ericsson and LG, announced that micro-USB will be the future common connector for the mobile phones." http://www.connectedinternet.co.uk/2007/09/23/mobile-phone-charger-one-is-enough/.
http://www.onlinereview.org.uk/blog/blog-2007-09-24-1337.htm says "The Manufacturers that will be using the new micro USB are companies like LG, Nokia and Samsung. Mobile operators such as Vodafone, Orange, 3 and T mobile have also joined declared a consensus [sic] as well. Apple and Sony Ericsson however will not be changing their charging system."
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