Windows Server 2008 R2
Some features include:
- Hyper-V 2.0
- Live Migration
- Logical Processor Support
- Hot Add Remove Storage
- SLAT – Second Level Translation
- Dynamic Memory – across VMs
- Boot from VHD
- Terminal Services
- New API
- Connection Broker Extensibility
- Dynamic CPU allocation
- IP address virtualization
- Best Practices Analyzer
- Full MSI support
- New Management Features
- PowerShell 2.0
- Power Management
- Direct Access – No more VPN needed
- Branchoffice Cache
- Server Core - .NET, ASP.NET, PowerShell 2.0
Source: http://bink.nu/news/windows-server-2008-r2-overview-feature-overview.aspx
Source: http://blogs.technet.com/windowsserver/archive/2008/10/28/announcing-windows-server-2008-r2.aspx