This message on Site stuff deserves greater circulation:
The new registration process will be implemented next week, meaning that upon joining, users will need to choose a username.
Yaaaaaayyyyyyyyyyyyyy!
And before anyone else points it out, yes I know some contrary types will choose to go that way anyway. But presumably not many, so we'll be able to work out who they are. And if it makes life difficult for a few more trolls, it's got to be a plus, right?