Differences between Windows Server 2008 Standard Edition and Windows Server 2008 Enterprise Edition.
Standard Edition

maximum number of processors:? 4

maximum number of RAM for x86: 4GB, for x64: 32 GB

failover cluster nodes (Nodes): 0

terminal services gateway: 250

Enterprise Edition

maximum number of processors:? 8

maximum number of RAM for x86: 64GB, for x64: 2 TB

failover cluster nodes (Nodes): [...]

Windows Server 2008 R2 Beta is ready to download.
Microsoft published new version of their operating system for testing.
Top 10 Reasons to Upgrade to Windows Server 2008 R2:
1. Powerful Hardware and Scaling Features.
2. Reduced Power Consumption.
3. Hyper-V??c in Windows Server 2008 R2 (live migration).
4. Increased Desktop Management Efficiencies.
5. Easier and More Efficient Server Management.
6. PowerShell 2.0.
7. [...]