If you feel like the material you are finding is too basic for you it probably means you are looking in the wrong places for your knowledge level. At some point there won't be many records available for the things you don't already know and you will have to dig into journals or follow the experts more directly for new material. You could also try to find conference recordings from events that the experts themselves like to attend. That and just avoid places like the Daily Mail like it has the plague.

Examples I enjoy:

University material:

MIT: http://www.youtube.com/user/MIT

Standford: http://www.youtube.com/user/StanfordUniversity

UCLA: http://www.youtube.com/user/UCLACourses

Techtalks:

http://www.youtube.com/user/GoogleTechTalks

http://media.ccc.de/

http://www.defcon.org/html/links/dc-archives.html

General interest (beyond TED):

http://www.youtube.com/user/iGNiTe

http://www.youtube.com/user/igniteboulder

http://www.youtube.com/user/ignitenight

http://www.youtube.com/user/ignitesault

http://www.youtube.com/user/plan8ts