Handy simple plugin for diabling an account when you don't want/need to delete the account (i.e a member who has left). This negates the need to delete that users content, comments or to attribute that users comment to another user.
(Usage of a users data would be relevant to your site so bear that in mind).
For situations where you can disable a user from being able to log into your site, this simply plugin fills that need.
A future improvement/suggestion would be to have any messages configurable, or use a language file.
Perhaps a 'reason field' so that if a disabled user attempts to log in, not only the disabled message is displayed but an admin configurable message displayed.
But those are just nicities... for now, it does what it says on the tin.