We just released a huge extension on the help system for Microsoft Dynamics AX 4.0 SP1.
This update contains:
·                 355 new online help topics
·                 596 new form help topics
·                 152 new developer topics

We now deliver a list of changed and updated topics with every refresh of our Microsoft Dynamics AX help files online. The list of changes and updates in the Microsoft Dynamics AX 4.0 SP1 documentation (since Dec. 2006) is available at: http://download.microsoft.com/download/5/d/5/5d50760d-c906-4aa4-87da-35cc058b0f16/DAX_ContentChanges_2007FEB.doc

Available Online or As A Hotfix

You can find the complete Microsoft Dynamics AX 4.0 SP1 help on the Web in the MSDN Library. In addition, you can download a patch containing the complete, up-to-date 4.0 SP1 documentation from either Partner or CustomerSource.