Microsoft informed that the live migration for Hyper-V will be in Windows Server 2008 R2.

RTM version of operating system Microsoft Windows Small Business Server 2008 has been realized. And will be available to download in November 2008.

RTM of R2 version is ready to download.
RTM R2 supports Windows Vista SP1, Windows Server 2008 and integrates support for application virtualization.
The following features are new:

Application Virtualization
Forefront Client Security Integration
SQL Reporting Services Reporting
Client Status Reporting
Operating System Deployment (OSD) Enhancements

More details and link to download is here

Microsoft published new guide about planning and design infrastructure in Windows Server 2008.
Main subject are:

System Center Operations Manager 2007
System Center Virtual Machine Manager 2008
Internet Information Services 7.0
NAP
Microsoft SoftGrid Application Virtualization
Windows Deployment Services
Windows Server 2008 Active Directory Domain Services
Windows Server 2008 Terminal Services
Windows Server Virtualization: Hyper-V and Virtual Server 2005 R2 SP1

For Windows Server 2003 I [...]

System State is backup file included:
The System Registry
The COM+ Class Registry Database
Boot and System Files
Windows File Protection System Files
Active Directory Database (Domain Controller)
SYSVOL Directory (Domain Controller)
Certificate Services Database (Certificate Server)
Cluster Service Configuration Information (Failover Cluster)
IIS Metadirectory (Web Application Server)