Journal of the International Society of Plato - Refereed publication for the promotion of international dialogue on Plato across different languages and scholarly approaches. Archives, including author index, available in English, German, French, Italian, and Spanish.
PhilosophyClassics.com: Plato - Essays on Plato's Republic, his doctrine of the soul, and his allegory of the cave, along with a biography, etexts, and a selection of quotes.
Plato - A Rochester Institute of Technology Professor's discussion of Plato's role in the History of Science
Plato and His Dialogues - Extensive site about Plato and his work, with biographical information, interpretation, indexes, and maps of the ancient world. By Bernard Suzanne.