When used in conjunction with an appropriate define-based virtual resource (see gist named "defined-virt-user-ssh-key"), this will define a user including their public SSH key.

virt-user-with-ssh-key

@accounts::virtual { 'jsmith':
  uid             =>  5001,
  realname        =>  'John Smith',
  pass            =>  '<insert password hash here>',
  sshkeytype      =>  'ssh-dss',
  sshkey          =>  '<insert SSH key here>',
  require         =>  Class['accounts::config'],
}