Flector

Truncate Comments is a plugin that hides a part of a long comment under a “Read more” link that, when clicked, reveals the hidden part of the comment. The plugin provides the functionality of Amazon.com comments.
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The plugin uses <a href="http://www.aakashweb.com/jquery-plugins/collapser/" rel="nofollow ugc">jQuery Collapser</a> by Aakash Chakravarthy.

Truncate Comments

The plugin uses Javascript to hide long comments (Amazon-style comments).

robfelty

Create collapsible archives by year or month. Features include: link to archive pages, display of individual posts and support for custom post-types.
<h3>Demo</h3>
I use this plugin in my blog at http://blog.robfelty.com

Collapsing Archives

Very helpfull

This plugin uses Javascript to dynamically expand or collapse the set of months for each year and posts for each month in the archive listing of your  …

Truncate Comments vs Collapsing Archives