Oddthinking

If your blog is over a year or two old, you may have noticed the list of archive pages is getting unwieldy.
This plugin is a widget that compresses the size of the arcgives list to two lines per year (three if the lines are narrow) rather than one line per per month.
<h3>More information</h3>
This widget is licensed under <a href="http://www.gnu.org/licenses/gpl-3.0.html" rel="nofollow ugc">GPLv3</a>.
Grateful thanks to <a href="http://tech.windsofstorm.net" rel="nofollow ugc">Alan Morgan</a> whose widget_archives2 I used as a template.
Potential developers should check out the <a href="http://www.somethinkodd.com/oddthinking/2007/03/29/more-theme-changes-2/" rel="nofollow ugc">development history</a>.
Finally, an obligatory plug for my blog, <a href="http://somethinkodd.com/oddthinking" rel="nofollow ugc">OddThinking</a>.

Compact Monthly Archive

Show a monthly archive list in a compact format - one letter per month.

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.

Compact Monthly Archive vs Expanding Archives