A Google App Script to notify someone specific when a file has been added to a folder.

Notifier.js

/**
 * Attribution: Alexander Gryson (agryson.net)
 * This script stores a listing of the files in a folder.
 * If a new item is placed in the folder, an email will be sent.
 * LIMITATION: This script can only handle about 70 listings due to the 9kb limit for properties.
 * If the number of listings goes above 50, a warning will be sent.
 */
function listFilesInFolder() {
  var folderID = '1234567890AZERTYUIOPQSDFGHJKLM_EXAMPLE'; //ID of the folder to watch
  var admin = 'admin_example@gmail.com'; //Email of the person to notify
  
  var items = DocsList.getFolderById(folderID).getFiles();
  var contents = [];
  var roster = JSON.parse(ScriptProperties.getProperty('store' + folderID));
  var contains = function(arrayIn, value){
    if(arrayIn instanceof Array){
      for(var i = 0; i < arrayIn.length; i++){
        if(arrayIn[i] === value){
          return true;
        }
      }
    }
    return false;
  };
  var notify = function(name, author, link){
    var subject = 'New draft for review';
    var body = 'There\'s a new draft for review titled "' + name + 
    '" from ' + author + 
    '. View the file here: ' + link;
    GmailApp.sendEmail(admin,subject,body);
  }
  
  //Here's where the magic happens
  for (var i = 0; i < items.length; i++) {
    //Use IDs so that name changes don't break everything
    var value = items[i].getId();
    contents.push(value);
    if(!contains(roster, value)){
      notify(items[i].getName(), items[i].getOwner(), items[i].getUrl());
    }
  }
  
  //Store our new roster
  ScriptProperties.setProperty('store' + folderID, JSON.stringify(contents));
  
  if(contents.length >= 50){
    var warnSubject = 'Roster nearly full.';
    var warnBody = 
      'Notifications only work if there are less than 70 items in the folder. The folder called ' 
      + DocsList.getFolderById(folderID).getName() + 
      ' has at least 50 items and will soon start producing errors. View the folder here: ' 
      + DocsList.getFolderById(folderID).getUrl() + 
        '. If you really need more than 70 items in the same folder, please let Alex (' + admin + 
        ') know so he can write a more robust script';
    GmailApp.sendEmail(admin,warnSubject,warnBody);
  }
};