Photo book panorama over 2 pages

Select a page of your Book and show the Layout Options (View -> Layout).

select a Layout with one Photo per page. Set the Layout selector to "Spread" and deselect "Include text". This will give you a spread across two pages to drag your panorama to.

Regards

Léonie

P.S. You need a plain book theme without frames to do this, eg. the "Picture Book" theme,

A screenshot of the Layout Options panel - picture book theme.

after adding a paorama to the spread page

what version of iPhoto" Pior to '11 you place the photo twice - opnce on each side of the book in a ful page layout - for '11 you use the spread layout as Leonie shows

LN