Today I came across a website for (tin/penny/Irish) whistle players called Whistle This! which is based on an interesting idea: every two weeks a new tune is posted on the site with the sheet music, whistle notation and a recording. Visitors are invited to learn the tunes, record themselves playing them, and to send in their recordings, which others can then listen to and comment on. There is also a forum for whistle and music-related discussion. I plan to start learning the tunes and sending my recordings in, perhaps starting when the next tune is posted.
This concept could possibly be adapted for language learning. Instead of tunes you could have dialogues, extracts from literature, poems or short stories for people to learn, recite and record. Ideally you’d have native or fluent speakers providing the initial recordings. Maybe someone has already thought of this and a site or sites like this already exist, though I haven’t found any yet.