Jacob N. Breetvelt

The purpose of this plugin is to minimize page load time and resource usage by updating the page title and content only rather then reloading the entire webpage. 
The new contents and titles are fetched by ajax calls.
Restriction: 
As the rest of the page like header including all styles and scripts, footer and sidebars are not affected, you should only use this to switch between pages with the same overall layout and requirements.
You can enter shortcodes in the page content that will show up as a button or a text link. 
When activating the link, the pages title and content will be replaced by the title and content of the specified page.
There are four possible independant arguments to the shortcode: 
– page (required). This can be the page title or the page id. 
– text (optional). The button text or textlink text. 
– title-elm (optional). The title element id or class if it is not the default as entered on the settings page. 
– content-elm (optional). The content element id or class if not default.
Examples: [pla page=”Tet page”] [pla page=”5″ text=”Go to the testpage”] [pla page=”My Page” content-elm=”#my-div”]

Page Load Ajax

This plugin enables the use of shortcodes that create links to replace the current page content with the content of another page.

mg12

This plugin isn’t only SEO friendly, but also provides a good user experience, you can filter achives and expand / collapse achive folder. It’s more faster after version 3.0.
Features:
<ul>
<li>Expand or collapse the monthly post archive listings.</li>
<li>Support for filtering options on AUTHOR and YEAR.</li>
<li>Caches the recent posts list, make page load faster.</li>
<li>SEO friendly.</li>
</ul>
Supported Languages:
<ul>
<li>US English/en_US (default)</li>
<li>简体中文/zh_CN (translate by <a href="http://www.neoease.com/" rel="nofollow ugc">mg12</a>)</li>
<li>Albanian/sq_AL (translate by <a href="http://www.romeolab.com/" rel="nofollow ugc">Romeo Shuka</a>)</li>
<li>Belorussian/by_BY (translate by Marcis Gasuns)</li>
<li>Czech/cs_CZ (translate by <a href="http://blog.prskavec.net/" rel="nofollow ugc">Ladislav Prskavec</a>)</li>
<li>Dutch/nl_NL (translate by <a href="http://wpwebshop.com/" rel="nofollow ugc">Rene Kleine</a>)</li>
<li>Français/fr_FR (translate by <a href="http://www.li-an.fr/blog/" rel="nofollow ugc">Jean-Michel MEYER</a>)</li>
<li>Hungarian/hu_HU (translate by János Csárdi-Braunstein)</li>
<li>Italian/it_IT (translate by <a href="http://gidibao.net/" rel="nofollow ugc">Gianni Diurno</a>)</li>
<li>Lithuania/lt_LT (translate by <a href="http://mantas.malcius.lt/" rel="nofollow ugc">Mantas Malcius</a>)</li>
<li>Polish/pl_PL (translate by <a href="http://www.diariusz.net/" rel="nofollow ugc">Artur</a>)</li>
<li>Russian/ru_RU (translate by kate)</li>
<li>Spanish/es_ES (translate by David Tejedor)</li>
<li>Türkçe/tr_TR (translate by <a href="http://ramerta.com/" rel="nofollow ugc">Hamdi Ömer Faruk</a>)</li>
</ul>
Demo:
<a href="http://www.neoease.com/archives/" rel="nofollow ugc">http://www.neoease.com/archives/</a>

WP-EasyArchives

Display your archive tree on custom page.

Page Load Ajax vs WP-EasyArchives