Fabrice Grinda is a terrific entrepreneur and investor, and he is really open with his ideas. Which is rad. Because they are very useful.
http://www.fabricegrinda.com/entrepreneurship/9-business-selection-criteria/
http://www.fabricegrinda.com/personal-musings/a-superangel%E2%80%99s-investment-guide/
http://www.fabricegrinda.com/personal-musings/angel-investing-secrets/