As announced at TechEd yesterday, v1 of Windows Server AppFabric was released to the web at the weekend (though like the Release Candidate, I found out the Chris Alcock's excellent Morning Brew blog). You can download it directly here, or through the Windows Platform Installer. There's an installation guide here. If you've been using the Beta 2 Refresh release, the installer will allow you to upgrade from this to the release version - there are details here.
Official announcement from the AppFabric blog