by Kapil Chugh on WordPress.org
A plugin which allows you to sort posts, pages, custom post type in ANY order and display the same in your sidebar.

Add new section based on select posts individually criteria.
While WordPress allows you to make your posts sticky, or even sort them in ascending or descending order, sometimes this is just not enough. What if you want to display the posts in ANY order you need? Unfortunately there is no such functionality in WordPress, which is where this plugin saves the day.
This plugin works on sections of posts, which you can define based on the following three criteria:
You can display ordered posts in theme with query_posts or get_posts or WP_Query like this :
query_posts(‘section_name=NAME_OF_SECTION’);
Here NAME_OF_SECTION must be replaced with your actual section name. If no section found with mentioned name then nothing will change.
OR
Once the sections are created, you can display these posts using widgets.
custom-templates folder of your plugin (/wp-content/plugins/my-posts-order/includes/custom-templates/loop.php) and (/wp-content/plugins/my-posts-order/includes/custom-templates/loop_rss.php).Now wasn’t that easy!