From the Configuration Manager product team blog:
The Configuration Manager documentation library (http://technet.microsoft.com/en-us/library/bb680651.aspx) has been updated on the Web and the following information lists the topics that are new or contain significant changes since the April 2009 update.
The latest content that has been updated on the Web has Updated: June 1, 2009 at the top of the topic.
To read about the details check out at the source at:
J.C. Hornbeck | Manageability Knowledge Engineer