Tatoeba

If you've ever been interested in languages - this is a site for you. It's unique concept is linking sentences together, not in the usual table format, but in a form of a neural net (their FAQ calls it a graph structure). People add sentences in one language: "It's a beautiful day." And people who are bi-lingual, or polyglots, translate it into other languages. One person may translate it into French and Russian; and another from French to Vietnamese; and yet another from Russian to Tagalog. Presto - you have the beginning of an English-Tagalog dictionary.