The latest SDK updates for July have just been released to MSDN. These updates (and all updates so far this year) all pertain to Dynamics AX version 4.0. The main link for MSDN is http://msdn.microsoft.com or you can go directly to the developer docs at http://msdn2.microsoft.com/en-us/library/aa493463.aspx.

To find out what's new and updated for July (or previous months in 2007), go to http://www.microsoft.com/downloads/details.aspx?FamilyId=23FA33F1-1879-4982-8C16-583D89C40901&displaylang=en.