Following on from my previous posts…
Windows Server 2008 runs pretty well on a laptop, even the 64 bit version - providing the vendor supplies the drivers. Even if they don’t, the Windows 7 or Windows Vista drivers usually work okay.
If you have the 64-bit version of Windows Server 2008 you then have the option of installing the Hyper-V Role (Hyper-V is 64-bit only).
However, after installing the Hyper-V Role you loose the ability for your laptop to hibernate. This is a bit of pain.