Microsoft has made changes in the CU packages, these changes are that we do not need to install the SharePoint Foundation CU package when updating SharePoint Server or Project Server.
This means upgrading will be faster!
More information can be found on the Microsoft SharePoint 2010 Update page on TechNet.
The download of the August 2011 CU can be found here:
- SharePoint Foundation 2010 (KB253050)
- SharePoint Server 2010 (SPF + SPS CU) (KB253048)
- SharePoint Server 2010 with Project Server 2010 (SPF + SPS + Project Server CU) (KB253049)