named_scope :unverified, :conditions => {:verified => false}

  # This makes a named_scope as desired, but duplicates the code in unverified.
  named_scope :inactive, lambda {{ :conditions => ["verified = ? and last_login < ?", false, Time.now - 3.months] } }

  # We can avoid the duplication with an explicit method. Can't we do this in a named_scope directly?
  def self.inactive2
    self.unverified.find(:all, :conditions => ["last_login < ?", Time.now - 3. months])
  end

  # e.g.... (but this does not work, natch)
  named_scope :inactiv3, lambda { User.inactive + { :conditions => ["last_login < ?", Time.now - 3. months] } }