How to install Hyper-V on Windows Server 2008?
This is stable virtualization environment in 5 minutes.
Step 1. Take a look that Your processor support virtualization (models VT-x or AMD-V).
Step 2. System Windows Server 2008 must have version x64.
Step 3. Confirm that update ?Hyper-V Update for Windows Server 2008 x64 Edition KB950050??? is installed.
Step 4. Run ??oServer [...]

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