I had previously seen clips of him talking about CAPTCHA / reCAPTCHA; however, in the Spark interview (and the TED talk), he goes on to discuss his latest project, called Duolingo. It’s hard not to get excited about what the project (still in beta) promises: a marriage between crowdsource translation and language learning.
If you want to skip directly to the part where he talks about the research questions that led to Duolingo, skip to the 8m37s mark.
I wonder how long the waiting list is to participate in the beta?
[update March 24th, 2012: received invitation to participate in Spanish or German Duolingo beta. I´ve tried the first couple of Spanish lessons, and I can already tell that Duolingo is going to be very addictive!]
From the TED video description:
“Duolingo will be a revolutionary product in which millions of internet users from around the world will work together to translate the internet and learn a new language at the same time. All for free.”