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Re:The scoop on reCAPTCHA founder's new startup Duolingo. by izuzak on Tuesday April 26, 2011 @09:53AM (#2485150)
A bit older, but way better presentation by Luis von Ahn on duolingo:

The Royal Society - "Augmented intelligence: the Web and human computation" (Louis von Ahn) http://royalsociety.tv/dpx_royalsociety/dpx.php?cmd=autoplay...

+ has excellent discussion at the end.

Re:The scoop on reCAPTCHA founder's new startup Duolingo. by newman314 on Tuesday April 26, 2011 @10:23AM (#2485274)
tl; dr summary please?
Re:The scoop on reCAPTCHA founder's new startup Duolingo. by mortice on Tuesday April 26, 2011 @10:34AM (#2485337)
The content of the presentation is much the same, albeit pitched at a different audience. To get straight to the discussion at the end (which is impossible effectively to summarise for you and well worth the time) skip to about 26:00 in the video.