Here is a list of a couple of useful and extremely easy to integrate widgets that you may use to add cool Web 2.0 looks and functionality to your website.
Dialogs.JS – Say goodbye to the boring default browser dialog boxes you are using on your website or online applications, here is Dialogs.JS!
Web 2.0 AJAX Loading Panel – Enhance your site’s look and feel during AJAX requests with the fully customizable state-of-the art Web 2.0 AJAX Loading Panel without writing a single line of code!
AJAX Gallery.XML – a lightweight, crossbrowser, skinnable and extremely easy to use component for displaying images in cool Web 2.0 looking style and a lightbox.
AJAX Contact Form – It is skinnable, highly customizable, localizable, crossbrowser and ultra fast. The installation and the configuration of the script is easy, and your form can be up and running on your website within minutes.
AJAX Guestbook – an easy to use, AJAX driven, crossbrowser and skinnable guestbook that will give your visitors pleasant Web 2.0 experience on your website.
TabStrip.XML – a lightweight, yet powerful, skinnable and crossbrowser AJAX driven control for creating tabbed interfaces for websites.