Greg Davis

Canadian

Andrew Coyne
Brian Milner
Coyne vs. Wells (video)
Mark Steyn

International

The Economist – Leaders
The Economist – World This Week
Christopher Hitchens
Eric Margolis

Environmental

Bjorn Lomborg
Climate Skeptic
Davis LLP – Energy and Sustainable Development
Lawrence Solomon
The Economist – Environment

Training

FightOpinion.com
Jordan Breen Show (audio)
Robb Wolf

Other

Coyote Blog
EconTalk (audio)
FreeDomain Radio (audio)
Gene Expression
Marginal Revolution
Overcoming Bias
The Big Questions

Always a tough one to explain concisely to the uninitiated.  Mark does a decent job here:

YouTube – Lose Weight With Primal Plan.

Tyler Cowen is on point as usual:

Bloggingheads.tv – The Evolution of God

Check out richarddawkinsdotnet on YouTube for two full hours of discussion between Richard Dawkins, Sam Harris, Christopher Hitchens, and Daniel Dennett. Good stuff.

FYI you can create your own YouTube RSS feeds by users very easily, just use this url with user richarddawkinsdotnet as an example. Simply replace ‘richarddawkinsdotnet’ with any user’s name on YouTube:
http://gdata.youtube.com/feeds/base/users/richarddawkinsdotnet/uploads