some others I found worthwhile checking:

Human and Animal Behavioral Biology - Robert Sapolsky

General Relativity - Bertrand Russell - ABC of relativity

For LWers I believe Yudkowsky>Feynman>Drescher in explaining Quantum Physics by analogy.

Memetics, from the standpoint of engineering effective memes -> Made to Stick

Memetics, as a discipline, field of knowledge -> Tim Tyler

Anything he talks about - Steve Pinker

Zoology - Dawkins

Cognitive Neuroscience -> I have delved long and hard in this field and have yet to find a good explainer. Jeff Hawkins and Terrence Deacon are ok.

Winning -> Randy Pausch

Biotech trends -> Juan Enriquez

Statistical trends in humans -> Hans Rosling