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.

rickacc

Linked Future Posts Widget acts very much like the upcoming posts widget by displaying 
scheduled posts instead of published ones, but includes a link to each post (using slug/post name). Requires WordPress 2.8+
Use this plugin in conjunction with the Future plugin from Marion Sudvarg to create a Post Grid of scheduled events and a list of scheduled 
events on the post page. Events that change from scheduled to published status will automatically be removed from the grid and list.
Linked Future Posts Widget is a derivative of the Upcoming Posts Widget plugin created by Aaron D. Campbell.

Linked Future Posts Widget

A widget that displays a list of scheduled posts with links to the posts.

Blog Post Calendar Widget vs Linked Future Posts Widget