Adobe just released 2 important labs releases that further their commitment to interoperability between Flex and AJAX:

1. Ajax Data Services library
   A new JavaScript library that lets Ajax developers access the powerful messaging and data management capabilities of the Flex Data Services product directly from JavaScript.
   With this library, companies can integrate application clients built using Ajax technologies with the same back-end data services used by Flex application clients. This means that data from Flex applications can now be automatically synchronized with other Ajax applications, ensuring that both users see the most current, accurate information.
2. Flex Ajax Bridge (FABridge) update
   Adobe already provides FABridge to allow JavaScript-enabled components to interoperate with Flex-enabled components embedded in the same web page. But as of today, significant updates have been made to FABridge, enabling better interoperability on the client. With the introduction of Ajax Data Services, combined with FABridge, developers can now leverage the full benefits of both the Flex 2 SDK programming model and the powerful Flex Data Services providing full interoperability with existing or new Ajax applications.

The new releases are online at:
Ajax Data Services library
http://labs.adobe.com/wiki/index.php/Ajax_Data_Services
Flex Ajax Bridge (FABridge) update
http://labs.adobe.com/wiki/index.php/Flex-Ajax_Bridge