The Internet Explorer team described how to slipstream IE 8 Beta 1 into a Windows Vista or Windows Server 2008 image using the process described at http://blogs.msdn.com/ie/archive/2008/06/20/slipstreaming-ie8.aspx . Here's the same basic process
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Read the complete post at http://blogs.technet.com/mniehaus/archive/2008/07/03/installing-ie-8-beta-1-as-part-of-an-mdt-2008-lite-touch-deployment.aspx