var items = $('.alphaList li').get();

items.sort(function(a,b){
  var keyA = $(a).text();
  var keyB = $(b).text();

  if (keyA < keyB) return -1;
  if (keyA > keyB) return 1;
  return 0;
});

var ul = $('.alphaList');
$.each(items, function(i, li){
  ul.append(li);
});