Ashley

Expanding Archives adds a widget that shows your old posts in an expandable/collapsible format. Each post is categorized under its year and month, so you can expand all the posts in a given month and year.
This plugin comes with very minimal CSS styling so you can easily customize it to match your design.
JavaScript is required. No IE support.

Expanding Archives

This plugin adds a new widget where you can view your old posts by expanding certain years and months.

Justin Watt

After activating the plugin, you will have two new template tags at your disposal:
<pre><code><?php previous_archive_link( 'format', 'link' ); ?>
<?php next_archive_link( 'format', 'link' ); ?>
</code></pre>
They adapt their output depending on whether the date archive is a day, a month, 
or a year, and they will only output a link for an adjacent time period in which you 
have published posts. Both tags take two string parameters, format and link.
The format parameter defines what comes before and after the link. In it, <code>%link</code> 
will be replaced with whatever is declared in the link parameter below. <code>previous_archive_link</code> 
defaults to “<code>&laquo; %link</code>” and <code>next_archive_link</code> defaults to “<code>%link &raquo;</code>“.
The link parameter defines the link text. Both tags default to “<code>%date</code>“, the 
adjacent archive page’s localized date.
If you’re interested in contributing to the code behind this plugin, it’s also hosted on GitHub: 
https://github.com/justincwatt/wp-adjacent-archive-links

Adjacent Archive Links

Adds two new template tags to output previous and next links on date archive pages.

Expanding Archives vs Adjacent Archive Links