Last mid February Windows 7 SP1 went RTM.
Soon after it was made available on TechNet & MSDN for subscribers, including integrated copies w/ the OS & SP1.
Today while checking whats new at TechNet I discovered that a new (integrated) media refresh of SP1 was available on 5/12/2011.
Here is the details:
This media refresh includes the installation hotfix described in KB Article 2534111. No other changes have been made to the product.
DualBootPRO