It gives you a list of words you are likely to look up in the dictionary as far as the given text is concerned, guesses a good dictionary definition for the words along with example sentences. And finally, it also makes a quiz for the words using both the definitions and example sentences. (Of course we give you the answer key too.)
Via Nik Peachey
This is a great free tool for creating word lists and vocabulary quizzes from online text. It works within minutes. A great time saver.