Excerpt Editor by Author Ozz provides a convenient place for creating and editing all WordPress excerpts. It can also add custom excerpts for pages (not possible without a plugin). Version 1.0 contains many new features: option to append excerpts from the most recent posts or from the sub-pages to all Posts and/or Pages, option to replace the content with the excerpt on the Home page, all archive pages and/or all tags pages. This eliminates content duplication (SEO).

Currently the interface is only in English, but the excerpts can be in any language supported by WordPress. The plugin also includes .pot file for easy translation.

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Get the Plugin http://wordpress.org/extend/plugins/excerpt-editor/