From Mankiw's blog, about economics.

1. Principles of economics, translated

http://www.youtube.com/watch?v=VVp8UGjECt4

2. Principles of Economics, Rap Version

http://www.imeem.com/educationalrap/music/xY4REVq-/rhythm_rhyme_results_demand_supply/

3. How careers begin

http://gregmankiw.blogspot.com/2008/10/how-careers-begin.html