Using Twitter

http://socialtriggers.com/twitter-tips/

Larry Smith, Entrepreneurship, Economics

http://economics.uwaterloo.ca/larry-smith

http://lwsmith.ca/

Larry's TED Talk on "Why you fail to have a great career"

Interview highlights on entrepreneurship

Mathematics for the Practical Man - George Howe

http://books.google.com/books?id=KUBpCUr5jC8C&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

See also:
Arithmatic for the Practical Man
Algebra for the Practical Man
Trigonometry for the Practical Man
Calculus for the Practical Man