ShinichiN

This plugin adds a widget to display furture scheduled posts list on your sidebar. You can specify how many posts to be listed.
<ul>
<li><a href="https://github.com/ShinichiNishikawa/Widget-of-the-Future" rel="nofollow ugc">GitHub</a></li>
<li><a href="http://nskw-style.com/2013/wordpress/plugin-downloads/Widget-of-the-Future.html" rel="nofollow ugc">Plugin Homepage</a></li>
</ul>
<h4>Title and post counts</h4>
In the widget page, you can specify the title and the number of posts.

Future Widget

This plugin adds a widget to display furture scheduled posts list on your sidebar. You can specify how many posts to be listed.

Ryan

Aelora

Make it easier on yourself to schedule future posts.
Auto Future Date allows you to quickly and easily schedule posts based on the 
last post on your site. A simple click on a link and your post will be scheduled 
for a future date based on a set of simple rules that you set up.
I use this on a blog of mine where I write several posts at a time and want to 
spread them out rather than publishing them all at the same time. Future posts 
are great for this, but I found myself going back and forth to the calendar 
to schedule.
When activated the plugin adds an “Auto” link right next to the link that you 
use to schedule a future post. Clicking on the Auto link makes an Ajax call that 
will set the date for your post at some point in the future, using rules that you 
set.
More information at <a href="http://www.nutt.net/tag/auto-future-date/" rel="nofollow ugc">Nutt.net</a>

Auto Future Date

Adds an "Auto" link to your post page that will automatically schedule your next post based on the most recent post.

Future Widget vs Auto Future Date