Sripteka is a cool new library with lots of useful Prototype scripts . The website is also very much user-friendly, with option to multi-select tags and display scripts.
Like Ajax auto complete in those cutting edge applications? Auto complete has a widely usage today, especially in Accounting, CRM, HR, ERP and Manufacturing software. 
CAPXOUS is the most simple, elegant, beautiful Ajax autocomplete component. It supports browsers such as IE 6.0 7.0, FireFox 1.0 1.5 2.0 & Safari 2.0
The latest version, 1.2.6, is now available for download. Basic examples for ColdFusion, PHP, Java and .NET included.
dhtmlxTabbar is a JavaScript tabbar control for creating dynamic tab-navigation interface. This control lets you add nice looking and powerful multiline* tab bar to your site or web application.
The control can be easily initialized on a web page that makes building of DHTML tabbed interface a breeze. Just assign any elements on your page (for example DIVs) to tabs of Tabbar, and it will automatically do all work for you - the component will switch these elements displaying them by clicking on corresponding tab (see sample code for easy and fast initialization at the bottom of this page).
Tabs can be left, right, top or button aligned. You can define tabs appearance according to different visual styles (predefined or your own). Cross-browser compatible, XML driven and fully configurable dhtmlxTabbar with rich javascript API provides a simple but powerful solution for building client-side navigation. Togather with other dhtmlx components: dhtmlxTree, dhtmlxGrid/TreeGrid, dhtmlxMenu and dhtmlxToolbar - it constitutes ready to use basis for any AJAX driven web based application.
ModalBox is a JavaScript technique for creating modern (Web 2.0-style) modal dialogues or even wizards (sequences of dialogues) without using conventional popups and page reloads. And yes, it may also be useful for showing bigger versions of images. :)
ModalBox is built with pure JavaScript and is based on Sam Stephenson’s excellent Prototype JavaScript Framework and valid XHTML/CSS. ModalBox uses AJAX to load content.
![Build Your Own AJAX Web Applications [Tutorial]](http://img307.imageshack.us/img307/3326/byoajax2hv.png)
Matthew Eernisse has posted a really nice tutorial at sitepoint about building own AJAX web applications. This tutorial is an excerpt from Matthew’s new book, Build Your Own AJAX Web Applications. Starting up with the evolution of AJAX the article covers the subject nicely. Even though the way of presentation is almost like “Professional AJAX“, the new book looks like its very informative and a great read.
MuseStorm provides services that are built on top of dynamic Web data such as RSS feeds and Web APIs. The Internet is radically changing and that data-driven Web applications are going to revolutionize the Web as we know it.
MuseStorm’s servers aggregate data from Web APIs and RSS feeds and distribute it through a vareity of means to Blogs, Web sites and Applications. The company’s technology enables it to scale quickly to support new Web APIs and distribution formats. MuseStorm currently provides the following services using the aggregation technology we developed:
Widgets
A wide array of Web Widgets for bloggers and Web site owners. The Widgets can be added to any Web page without programming knowledge, adding dynamic content to the page.
AJAX Components for Web applications
Javascript-ready components that provide access to multiple Web APIs easily with no AJAX or API knowledge needed.
Wufoo is a web-based tool to help you build and host amazing online forms. In only a few short minutes, you can create a mailing list, a marketing survey or even a complete customer management system. In other words, Wufoo is an Internet application that helps anybody build amazing online forms. When you design a form with Wufoo, it automatically builds the database, backend and scripts needed to make collecting and understanding your data easy, fast and fun. Because we host everything, all you need is a browser, an Internet connection and a few minutes to build a form and start using it right away. As it is beta stage right now, its tough to see how it would compete with JotForm.
Currently, Wufoo is still in development but if you want to get involved, try out their interface demo and tell us what you think. If you just want to know more, check out the FAQ & Screenshots. If you sign up for our mailing list, we’ll send you more info as it becomes available.
What can I build with Wufoo?
Google has released a AJAX Search API which allows you to embed a search control that displays the results inside of the page using AJAX requests. You can sign up here