I guess there's been some confusion around the final release date for Windows Home Server Power Pack 3 (PP3). Microsoft has this to say about the issue today:

On July 17, 2009, Microsoft announced the Windows Home Server Power Pack 3 Beta, which will improve the Windows Home Server experience with Windows 7 and Windows Media Center. Microsoft received tremendous community support and helpful feedback from beta testers. Based on this feedback and to ensure product quality, we will continue with additional testing of the software.  We will not ship the final release of Power Pack 3 until the community has validated our work. We expect to deliver before the end of the year. For those Windows 7 users who do not have the Beta installed, there are a few important scenarios they should be aware of. These scenarios can be addressed by downloading and installing the Power Pack 3 Beta for the most optimal experience for Windows 7 users on a Windows Home Server network.

More info is available on the Windows Home Server blog.