This excerpt taken from the AMZN 8-K filed Sep 18, 2007.
3.2 Number and Tenure
The number of Directors shall be fixed from time to time exclusively pursuant to a resolution adopted by the Board of Directors.
No decrease in the number of Directors shall have the effect of shortening the term of any incumbent Director. Each Director shall serve for the term he or she was elected, or until his or her successor shall have been elected and qualified, or until his or her death, resignation or removal from office. Directors need not be stockholders of the corporation or residents of the State of Delaware.