The following link will take you to a Channel 9 screen cast where you can learn about the new features of the AX 2009 AIF Web Services.

The following are some of the enhancements to Application Integration Framework (AIF) in AX 2009 AIF Web Services.

1.       Create, read, update, and delete operations are now supported.
2.       The programming model for AIF supports document services that encapsulate business logic and are the interface between AX 2009 and external systems.
3.       AIF provides functionality for consuming external Web services from within X++.
4.       New document services for additional commonly-used documents.


http://channel9.msdn.com/Blogs/SanjayJain/Microsoft-Dynamics-AX-2009-AIF-Web-Services-Screencast