This video walks you through some of the new and updated features in the Windows 7 Release Candidate. http://download.microsoft.com/download/2/9/3/293FCBA7-E0F2-4ACC-BE30-854B018F8559/WhatsNewWindows7RC.wmv
Windows XP Mode on Windows7 with Windows Virtual PC is designed for small business users, For Enterprise customers, MED-V is the way to go. More information: http://windowsteamblog.com/blogs/business/archive/2009/04/28/how-med-v-v2-helps-you-manage-windows-xp-mode.aspx http://www.microsoft.com/presspass/features/2009/Apr09/04-28Win7QA.mspx
In the video below Brian Desmond and Laura talk about the new things that come with Windows Server 2008 R2 AD.