1)Ajax Contact Form to send email: http://www.bitrepository.com/a-simple-ajax-contact-form-with-php-validation.html
Verify if the msg is 15 characters or more, if email address is missing, the form disappear after the message is sent successfully.

2)SitePoint Ajax & jQuery Tutorial: Easy Ajax with jQuery random message on screen generator and a chat room

3)Large Bunch of jQuery Tools – A must have: 10 Easy jQuery Tricks for Designers

4)10 Easy jQuery Tricks for Designers

5)Using jQuery Tools without downloading: (from http://flowplayer.org/tools/download/index.html )

jQuery Tools from CDN

Here is a list of all available jQuery Tools combinations from a free Content Delivery Network.

<!-- UI Tools: Tabs, Tooltip, Scrollable and Overlay (4.05 Kb) -->
<script src="http://cdn.jquerytools.org/1.2.5/tiny/jquery.tools.min.js"></script>

<!-- Form tools: Dateinput, Rangeinput and Validator. No jQuery library. (5.68 Kb) -->
<script src="http://cdn.jquerytools.org/1.2.5/form/jquery.tools.min.js"></script>

<!-- ALL jQuery Tools. No jQuery library -->
<script src="http://cdn.jquerytools.org/1.2.5/all/jquery.tools.min.js"></script>

<!-- jQuery Library + UI Tools -->
<script src="http://cdn.jquerytools.org/1.2.5/jquery.tools.min.js"></script>

<!-- jQuery Library + ALL jQuery Tools -->
<script src="http://cdn.jquerytools.org/1.2.5/full/jquery.tools.min.js"></script>

If you prefer to load the jQuery library separately the recommended practice is to load jQuery from Google’s CDN service. Make sure the jQuery library is always loaded before the jQuery Tools library.

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

6)Simplest Tooltip: http://kaibo2.com/test/jquery/tooltip.htm
7)Learn and try it out:http://www.w3schools.com/jquery/default.asp  http://www.w3schools.com/jquery/jquery_examples.asp