The theatrical version for The Two Towers will be released on Aug. 26, 2003.
The extended version with 41 minutes of extra footage (supposedly including many scenes from the book which did not make it to the screen if Amazon can be believed) will be released on Nov. 18, 2003.
And I just found out the official release date for Return of the King to theaters will be Decmeber 17, 2003 -- right in the middle of my week off of work!