Microsoft released a Windows Media Services (WMS) package for Windows Server 2008 June CTP this week. Bill Staples, who runs the Web Server engineering teams at Microsoft, says the package is now supported on the Web SKU, though the download page says some features (such as the WMS Cache/Proxy plug-in) are not supported.

From the download page:

Use this release of Windows Media Services to test a Windows Media server running the Windows Server 2008 (June CTP) operating system in a test environment. Microsoft Windows Media Services is an industrial-strength platform for streaming live or on-demand audio and video content over the Internet or an intranet.

Here is the WMS package download, and more information on the June CTP.