Very nice article, will keep that in mind when trying to help others with promises. Also helped me to re-understand some things :)

One thing though, Advanced mistake #4, is in my opinion good answer, the Q library however gives a (afaik) non-a+-standard way of doing that which I like:

from:

  getUserByName('nolan').then(function (user) {
    return getUserAccountById(user.id);
  }).then(function (userAccount) {
    // dangit, I need the "user" object too!
  });

to:

  getUserByName('nolan').then(function (user) {
    return [user, getUserAccountById(user.id)];
  }).spread(function (user, userAccount) {
    // I do have the user object here
  });