Ævar (<http://en.wikipedia.org/wiki/User:Ævar_Arnfjörð_Bjarmason>)
made a tool recently that enables bureaucrats to rename users and told
me yesterday that Tim Starling has just deployed it at the servers.
Therefore, any bureaucrat can change the username of users on their
wiki using [[Special:Renameuser]].
For more details, please see
http://en.wikipedia.org/wiki/Wikipedia:Changing_username
http://meta.wikimedia.org/wiki/Changing_username
http://meta.wikimedia.org/wiki/Requests_for_permissions#Requests_for_name_c…
http://meta.wikimedia.org/wiki/Stewards#Instructions_for_changing_usernames
http://en.wikipedia.org/wiki/Wikipedia:Bureaucrats#Instructions_for_changin…
Please translate this into your language and let the people on your
project know about this new process. People on wikis without
bureaucrats can make their request at [[meta:Requests for
permissions]] instead.
Angela.