The new Forms API comes with an
#ahah attribute that lets you specify the trigger event, e.g. a mouse click, the callback URL that will be requested after the event occurred and the ID value of the HTML element where the server response will be displayed. Pretty awesome stuff.
In this article I describe how you can parse and display Yahoo Pipes data returned as a JSON feed. Yahoo Pipes can be used as a data aggregator that lets you mashup online data sources, such as RSS feeds. To learn more about Yahoo Pipes and how to create them you can watch this video on how Yahoo Pipes work.
Google has released a new AJAX Search API that lets you integrate a dynamic Google Search form on your website using AJAX technology. Currently the API is an experimental beta version (V0.1) not suitable for production sites. The API can be used on commercial websites provided they are not exclusively available for paying customers or only within an enterprise or intranet application. Version 1.0 of the API will probably support advertising features.