I'm working on my Spanish and lovin Duolingo.
One nagging drawback is my curiosity of more words in their set vocabulary.
I found this free app on Droid called 'Spanish Vocabulary Surfer'.
The concept is that the user can browser internet sites and then point and click over a specific word on the web that they do not undertsand and it is translated from Spanish to English.
The user can then save that word to a glossary for testing and practice later via multiple choice word quizzes and spelling quizzes for that specific word.
Thus, the user can add their own personal word list.
I think it's a great concept which can compliment duolingo and the students proficiency of Spanish.
Gracias por leer. TR in NY