Foreign Language teachers take note of this website. A web 2.0 community site called "Cucumis" is harnessing the collective intelligence of the multi-lingual community for the purpose of translating text online. It is a way for linguists to help each other out. The way it works is that one gains points when one translates a text and you need points to submit a text to be translated. One gets promoted to expert when one accurately translates numerous amounts of text.
I could see learning activities in an online or f2f foreign language course in which students are required to earn so many points a week for doing quality translations. Any other ideas?