What is the difference between Executive Director and (Non-Executive) Director?

From the links:

• http://www.differencebetween.com/difference-between-director-and-vs-executive-director/
• http://uk.answers.yahoo.com/question/index?qid=20061118171549AALMzvl
• http://wiki.answers.com/Q/Difference_between_an_executive_director_and_non-executive_director

Executive Director:
Internal
Hands on involvement in day to day work
More power

Non Executive Director:
External
Offers expertise
Less power

(P.S: This is just a generalization. Do read the material at the links above for details)