Launched Tuesday, Duolingo offers users the ability to learn a language at their own pace and for no cost.
Sounds very exciting. I haven't had time to check the site out yet, but I hope to post a review tomorrow. In the meantime, check out the articles below.
• DuoLingo Review: The Quick, Easy and Free Way to Learn A Language (Fluent in 3 Months)
• Duolingo Review (PCMag)
• Duolingo (Wikipedia entry)
• Luis von Ahn: Massive-scale online collaboration (TED Talk—from 8:40)
• Duolingo translates the Internet for free (CNET)