TCBarrett

This plugin requires is just the front end javascript library, the following two things to be done in support: 
1. Add the class ‘simpleajaxform’ to your form. 
2. Make sure you have the correct wp_ajax handler hook defined.
It was primarily built as an example for a blog post.

Simple AJAX Form

A simple jQuery javascript library to ajax enable forms.

Bernhard Kau

WP Instant is deprecated and will be removed from the plugin directory on October 9, 2023, 12 years after its first release. You can find my other plugins <a href="https://profiles.wordpress.org/kau-boy/#content-plugins" rel="nofollow ugc">on my WordPress profile page</a>.
Integrates a Google Instant Search to your blog. The wp-instant plugin uses the Ajax.Updater function of script.aculo.us and the Form.Element.DelayedObserver class. A jQuery implementation will be following soon.
A list of all of my plugins can be found on the <a href="http://kau-boys.de/wordpress-plugins?lang=en" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugin page</a> on my blog <a href="http://kau-boys.de" rel="nofollow ugc">kau-boys.de</a>.

WP Instant

Integrates a google instant search to your blog. The wp-instant pluing uses the Ajax.Updater function of script.aculo.us and the Form.Element.

Simple AJAX Form vs WP Instant