WordPress lets you create excerpts for Posts, but not for Pages. Generally, that makes good sense. If you need excerpts for pages, though, it’s pretty simple to add.
function my_init() { add_post_type_support('page', array('excerpt')); } add_action('init', 'my_init');
That’s all there is to it. Works with WordPress 3.0+.
Update 2010-10-01: Hey, look, I made it into a plugin.