Andre has posted his review of Microsoft's Windows Server 2008 R2 operating system. The review is pretty comprehensive and has a bunch of screenshots. Here is an excerpt:

With the release of Windows 7 Client Microsoft is also accompanying it with an upgrade to Windows Server 2008 adding the ‘Release 2’ moniker which in my opinion adds some major improvements that make the cohesive experiences between both platforms beneficial to both Administrators and business users on the go. Don’t be concerned though, Windows 7 works just fine in existing Windows Server 2008 and 2003 environments, but if you want to take advantage of the synergies, deploying both Windows 7 and Windows Server 2008 R2 can definitely be worth your while. Honestly, I don’t know why Microsoft didn’t bother to call this upgrade Windows Server 2010 because of the numerous improvements Administrators and business users can expect. One of the significant changes Windows Server 2008 introduces with the R2 release is to focus on an all 64 bit strategy. Microsoft has committed to their promise of making Windows Server 2008 released back in February 2008 the last 32 bit release of Microsoft’s flagship NOS. With the plethora of 64 bit capable systems out there today and those that have been on the market for the past few years, I don’t see anything to complain or worry about. This does not mean the end of 32 bit applications either; we will continue to see those thrive on 64 bit operating systems for years to come. AMD which introduced the x86-x64 architecture with the debut of the AMD 64 back in fall 2003 developed an innovative method of emulating the x86 layer at full speed, while maintaining full compatibility with 32 bit apps and presenting opportunities to address larger amounts of memory beyond 4 GBs. Since then, 64 bit processors have become wide-spread with Intel introducing the extensions to their brand of processors back in 2005.