Over the weekend we released an interim build of Windows Vista, also known as an EDW, or External Developer Workstation.  This build is number 5728 and serves as an update to RC1 and runs in parallel with that release. 

The build is available as an ISO download in both X86 and X64 versions from http://download.windowsvista.com/preview/rc1/en/download-5728.htm

You will need a Beta 2/RC1 product key to activate.

The window is rapidly closing for download of the English build, as we're nearing our targeted download quantity.  If you've not yet downloaded the build, I would suggest doing so today.

This build (5728) has a number of improvements and updates from RC1, but has not been put through the same internal testing process as RC1 and therefore may be unstable in certain installations. We are making this release available for a limited time only (and only by download) in order to get broad distribution and testing in a variety of PC configurations.

I have been running this build at home and work for a week and a half now, and you will notice numerous improvements since 5600.  You should also find more performance improvements and fit and finish refinements in 5728 over build 5600. Also we have added the ability to disable the Windows Startup sound.  ;-)