A simple ruby script that backs up the original Xcode file templates and then changes the comment block at the top of each new file in Xcode with a different template.

Change the Xcode New File Template Comment Blocks

require 'fileutils'

class ModifyXcodeFileTemplateCommentSections
  XCODE_TEMPLATE_DIR="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Templates/File Templates"
  
ANNOYING_COMMENT_BLOCK = <<-EOB
//
//  ___FILENAME___
//  ___PROJECTNAME___
//
//  Created by ___FULLUSERNAME___ on ___DATE___.
//___COPYRIGHT___
//
EOB

PREFERRED_COMMENT_BLOCK = <<-EOP
// ___FILENAME___

EOP

  def self.validate_write_access!
    unless File.writable? XCODE_TEMPLATE_DIR
      puts 
      puts "You need to run with sudo."
      exit
    end
  end
  
  def self.run
    validate_write_access!
    
    backup_tarball = "#{ENV['HOME']}/XcodeFileTemplateOriginals.tgz"
    
    if File.exists? backup_tarball
      STDERR.puts "#{backup_tarball} already exists. Aborting."
      exit
    end
    
    system("tar czvf #{backup_tarball} \"#{XCODE_TEMPLATE_DIR}\"")
    puts "Backed up originals to #{backup_tarball}"

    puts "Modifying Xcode File Templates..."
    Dir.glob "#{XCODE_TEMPLATE_DIR}/**/___FILEBASENAME___.[hm]" do |filename|
      puts "#{filename}"
      File.open(filename, "r") do |file|
        text = file.read
        new_text = text.gsub(/#{ANNOYING_COMMENT_BLOCK}/, PREFERRED_COMMENT_BLOCK)
        
        File.open(filename, "w") do |file| 
          file.write(new_text)
        end
      end
    end
  end
end

ModifyXcodeFileTemplateCommentSections.run