John Godley

AJAX Calendar is a plugin that will display an AJAXified WordPress calendar. This enhances the functionality of the standard calendar by:
<ul>
<li>Allowing the asynchronous navigation of months, without updating the page</li>
<li>Added to blog as a widget</li>
</ul>
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://urbangiraffe.com/plugins/ajax-calendar/" rel="nofollow ugc">AJAX Calendar</a> page.

AJAX Calendar

AJAX Calendar is a plugin that will display an AJAXified WordPress calendar.

logicdesignbe

Smart Calendar Is a wordpress widget that modifies the wordpress calendar with ajax functionality. It displays the last post on the widget section, and when clicking on a day of the calendar it show the last post of that day on the same widget zone without reloading the current page.
You can visit the plugin blog at this adress: <a href="http://www.logicdesign.be/blog/plugins/smart-calendar-wordpress-plugin/" rel="nofollow ugc">Visit the blog</a>

Smart Calendar

Smart Calendar is a modification of the wordpress calendar using ajax.

AJAX Calendar vs Smart Calendar