http://news.bbc.co.uk/2/hi/technology/8323018.stm

A new mobile phone charger that will work with any handset has been approved by the International Telecommunication Union (ITU), a United Nations body.

Industry body the GSMA predicts that 51,000 tonnes of redundant chargers are generated each year.
The charger has a micro-USB port at the connecting end, using similar technology to digital cameras.
I'm looking forward to adoption of this. It would be nice if every little device needing a wall wart could use the same one, perhaps differing only in current capacity but sharing a common voltage and connector.