Changes in Windows Server 2008 over Windows Server 2003 SP 1

With the release of Latest Server OS Win 2008, there has been many changes in roles and features. With new features and roles comes optimization, enhanced security, less administrative tasks overhead, more productivity etc. Following are main features and roles introduced in Server 2008
Roles and Services
Server Manager
Server Core Installation
Active Directory Certificate Services Role [AD CS]
Active Directory Domain Services Role [AD DS]
Active Directory Lightweight Directory Services Role [AD LDS]
Active Directory Rights Management Services Role [AD RMS]
Application Server Role
DNS Server Role
FAX Server Role
File Services Role [DFS, FRS]
Network Policy and Access Services Role [NAP]
Print Services Role
Streaming Media Services Role
Virtualization Role [HyperV]
Web Server Role [IIS]
Windows Deployment Services Role [WDS]
Security Features
Authorization Manager
BitLocker Drive Encryption
Encrypting File System
Security Configuration Wizard
User Account control
Other Features
Boot Process and BCDEdit
Diskshadow
Failover Clustering
Group Policy
NLB Improvements
Windows Firewall with Advance Security
Windows Reliability and Performance Monitor
802.1x Authenticated Wired and Wireless Access