dimonuch

It displays the date in the format of the last “N” posts with a given PostType (date format, number of posts and other set in the widget settings).

PostType-Widget

It displays the date in the format of the last "N" posts with a given PostType (options set in the widget settings)

Ron Zvagelsky

Monthly grid view calendar widget highlighting archived and/or future posts.
Additional Features:
<ul>
<li>Popup details for each date with posts</li>
<li>Optional details include post author and comment count.</li>
<li>Ability to show posts by post type, category, specific taxonomy and/or term</li>
</ul>
<a href="http://presshive.com/plugins/wordpress-blog-post-calendar-plugin" rel="nofollow ugc">For more information or to request additional features, please visit the plugin page</a>

Blog Post Calendar Widget

The Blog Posts Calendar Widget allows you to display your archived or future posts in a calendar as a sidebar widget.

PostType-Widget vs Blog Post Calendar Widget