Post and Page Excerpt Widgets let you display excerpts from posts or pages in the sidebar. For some reason, page excerpts were taken out of WordPress somewhere along the way, so the widget requires the Page Excerpt plugin to handle those. If The Excerpt Reloaded is installed, the widget will use that function; otherwise it’ll do a normal excerpt.
Unlike any other widget I’ve seen, this one allows you to link the widget title. These widgets do support the usual WP ‘more’ links, but in some situations it makes more sense to link the heading than to append a link. Here, you can do either, neither, or both.
There's a screenshot on my site and the WP plugin page. Let me know if there are additional features you'd like to see in this!