The Basics:
Rich Dad, Poor Dad
From Good to Great
E-Myth
Cashflow Quadrant
Secrets of the Millionaire Mind

Market Research:
Market Research.com
Dow Jones Factiva
LookSmart FindArticles

Handling Financials:
Cashflow 101 (board game)

How to Get out of Debt

Productivity/Time Management:
Mission Control

People Management:
Primal Leadership
Birkman Assessment
Topgrading