TED talks are speechs from conferention TED (Technology, Entertainment, Design). It is everyear conferencion organised in several cities around the world. It was founded in 1984 by Richard Saul Wurman and Harr y Marks. From 1990 this conferention is organised reguraly. Main idea of TED is "ideas worth spreading". On these speechs are invited many peoples from different parts like science, art, desing, politics, education, culture, byznis, global questions and fun. TED websited hosts more than 1400 TED talks witch can be watched for free online. From 2009 there is possibility to get licence for making local conference witch name is TEDx merged with name of city where is conferention organised. For example TEDxPrague or TEDxBrno. In April 2009 there was about 15 milions of people with wathed more than 100 milions of TED Talks recording (for many recorded speechs there are possibility to turn on subtitles).
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You can try downloading from TED Talks on video example The history of our world in 18 minutes or you can try one of the latest videos bellow.