AjaxCoded

XML.com has a good article on building a simple RSS News Reader using AJAX.
The article steps through each aspect of building a reader with in depth explanations and also has the source code available to be downloaded.
Why are we using Ajax to parse our RSS? By using Ajax, we are passing over the work of processing the RSS XML file to the web browser, thus reducing server load. Also, Ajax allows the user to have a more seamless web experience, because we are able to fetch the entire RSS XML file from the server without having to refresh the page. [...]

Ajax in Action is an excellent book by Dave Crane, Eric Pascarello, Darren James

I first approached Manning about writing this book before the term ‘Ajax’ was coined, having spent several years battling through JavaScript and web-based projects and wishing that someone had written down the lessons that I was learning the hard way. I hope the book can help to smooth your introduction to programming using Ajax.
SOURCE : Dave Crane
Obviously Dave has a lot of background to offer us in JavaScript, even before Jesse James Garrett coined the term Ajax in February 2005. This is still one of [...]

Now this is the way it should be. Google has released a Google AJAX Search API - Issue Tracking web page.
Not only do they give us a forum with developers present to discuss the API we can now see all the progress on bugs and feature request. If you find a problem or have a request you still report them at the Google AJAX Search API Groups Discussion.
It also helps us know what they consider a real issue. Read the official post.
Thanks Google!

Yahoo has released their new Ajax oriented home page, July 17th, 2006.
It is a major improvement over the past design with a format that is aesthetically appealing and more inline with the current offerings of most major Search and Portal sites.
The site appears to be more Portal and less Search these days and that may just be the route Yahoo has decided to take in the future.
Has everyone conceded the searching to Google, especially since google is now a verb ?
You can keep up to date with Yahoo and their changes at the Yahoo! Search blog

ClearNova has probably the best single page of AJAX examples available with downloadable source.
The downloadable samples include full JavaScript & Java Source, a sample database for any SQL database, and a PowerPoint presentation.Source : ClearNova : Basic AJAX Examples
Examples include:
Ping!
Track Changes
Drop Downs & Form Handling
Get Customers By State (Parse Plain Text)
Get Customers By State (Parses XML)
Google Suggest Hack
Activity Log

Newsmap is a very different type of Ajax application. It is a treemap based on the Google News aggregator. It takes a little getting used to, but it is very easy to see the biggest news stories (pun intended). Clicking on a story will open up the news source in a new window.
Categories are color coded included World, Business, Technology, Sports, Entertainment and Health. A legend allows the user to turn on and off their preferred categories.
There is also an excellent time based legend allowing you to select a timeframe over the last week available in Newsmap.

Google has already updated the Google AJAX Search API based on feedback they have received from the Google Groups discussions. The New Feature: Site Restricted Search was posted yesterday. Now developers can add additional sources to the system and create custom labels to utilize site restrictions and limit the scope of the searches to specific sites. Keep up with the API at the Google AJAX Search API Blog.
For all searchers, you now have the ability to set a user defined label for a specific searcher. This lets you replace the current system defined label of “Web”, “Blog”, etc., [...]

Google has released a new Ajax Search API. This new API allows you to build custom search pages that utilizes Ajax to display results from several Google sources without reloading the page.
The API is very powerful and allows several options to customize not only the sources that are searched, but how the results are displayed and used. Results can be returned in linear or tabbed displays. Local, Web, Video and Blog searches are supported.
Check out the Google AJAX Search API and make sure to subscribe to the Google AJAX Search API Blog to keep up to date with all new [...]

It’s always interesting to watch how new technologies get incorporated to major sites. The Amazon Online reader looks like an excellent implementation of Ajax and Web 2.0.
Just look for the Search Inside graphic attached to any item. Once activated, the search inside Ajax system allows you to see different parts of the book. Each item is a little different and can include the covers, table of contents and excerpts.
This type system would be very helpful on intranets allowing company employees to browse through documentation and files.
Click on the graphic to launch the reader and see for yourself.

The WSCraft website boasts the ability to develop powerful internet and intranet solutions with just HTML familiarity. Tools like this are essential to today’s development climate. For the individual or smaller group developers it is hard to stay up to date with all the tools and keep a good creative development mentality at the same time. WSCraft licenses run from $35 to $659. The requirements for installation include PHP 4.2 or above, # mySQL 4.0 or above and Zend Optimizer installed.
As a development platform, WSCraft enables Web designers who are familiar with HTML to create/deploy powerful dynamic sites without [...]

Have you ever wanted to harness some of the Google power ?
Now you can. Google has released their GWT (Google Web Toolkit) to help develop Ajax applications using Java. They also supply a lot of sample code to help jump start your efforts. Google continues to show that they are not only willing to keep developing killer apps, but also to help the Internet community learn how to leverage the power of the Internet.
The Getting Started Guide is excellent and will have you creating Ajax applications in a hurry.

AJAX has the power to make your site more compelling and [...]

Although there are a lot of tutorials that have the same basic syntax and characteristics it is educational to look through as much as you can.
Every programmer has their own unique way of writing and documenting (or not) code and sometimes one particular style or structure may strike you differently and open up something that was not apparent before.
With that said, here are a few more tutorials to check out.
Link : DP- AJAX Tutorials