Giuseppe Mauriello: If you enjoy the presentations on TED Talks you may also enjoy Keen Talks, a website that takes thousands of lectures, presentations, and debates on various topics sorted by speaker, topic, category, and year of release.

From review article on MakeUseOf:

“Keen Talks’ minimalist design is a definite plus, allowing you to search for videos speedily.

…You can also read the quick and witty description of each video to help capture what the talk is all about.
What’s most interesting about Keen Talks is that its collection covers from various sources, compared to TED Talks where you are only limited with TED’s material…”

From About page on Keen Talks:

“We strive to build one stop destination for all users who want to learn and expand their knowledge in various fields like science, technology, health, psychology etc.

We curate any form of speech that can bring a fair amount of intellect on the table. We don’t curate just lectures or talks, but a whole range of engaging and interesting videos harnessed across the interwebs.

It’s an awesome library packed with video material, delivered by renowned intellectuals around the globe.
Obviously this is not an educational site in a classical form. We rarely curate lectures in classroom setting or a whole courses for that matter, unless they’re stunning. What we offer is more broad intellectual range of all different kinds of public appearances by some of the finest world’s intellectual figures…”

Read review article on MakeUseOf: 

http://www.makeuseof.com/dir/keentalks-video-collection-talks-lectures/

Check out it: http://keentalks.com