application.js

// This is my handler in the javascript
var uploadCompleteHandler = function(upload_options,event){
	$.ajax({
	      url: '<%= notify_rails_of_successful_upload_path(:format => :js)%>',
	      global: false,
	      type: 'POST',
	      data: ({
	        'authenticity_token' : '<%= form_authenticity_token %>',
		'upload' : {
		    'file_file_name' : upload_options.FileName,
	            'file_file_size' : upload_options.FileSize,
	            'file_content_type' : upload_options.ContentType
		}
		}),
	      dataType: 'script'
	   }
	)
};

controller.rb

  def swf_create
    @upload = Upload.new(params[:upload])

    respond_to do |format|
      if @upload.save
        format.js  { } # crazy cool stuff here 
      else
        format.js  { render :text => 'alert("Failure from Rails!");' }
      end
    end
  end

model.rb

after_create :move_upload_from_temp_to_final_resting_place

def move_upload_from_temp_to_final_resting_place
  # Rename the image on s3 (more of a move)
  AWS::S3::Base.establish_connection!(:access_key_id => S3Config[:access_key_id],:secret_access_key => S3Config[:secret_access_key])
  new_name = self.file.path
  old_name = "temp/#{self.file_file_name}"
  (1..5).each do |try|
    begin
      # Copy the file
      AWS::S3::S3Object.rename(old_name, new_name, S3Config[:bucket], :copy_acl => :true)
      break
    rescue Exception => e
      sleep 1
    end
  end

end