[Plugin: Page Excerpt Plugin] Too many nag screens for too little function

Not recommended. This plugin will insert annoying nag screens in your dashboard and settings pages. To add support for excerpts in pages in WP 3, simply add the following line to your theme’s functions.php:

add_post_type_support( 'page', 'excerpt' );

See https://wordpress.mfields.org/2010/excerpts-for-pages-in-wordpress-3-0/ for details.