http://news.bbc.co.uk/1/hi/technology/10096107.stm
As per the title really.
One thing i don't get is this...
I thought that anything with @gmail.com still went to a @googlemail.com address.British users with Googlemail addresses will be asked whether they wish to change their address. It will not affect the settings or functionality of the accounts, Google said.
When i would assume that if you were to change it to @gmail.com any addressed to @googlemail.com would still reach yours if that makes any sense.