Well - US$ prices anyway. I will have a dig for UK.

Details can be found at http://www.microsoft.com/presspass/press/2007/nov07/11-12HyperVPR.mspx

The headline stuff:

Pricing for all Windows Server 2008 products will be increasing by approximately 1 percent for all distribution channels. Estimated MSRP* are listed by each version below:

• Windows Server 2008 Standard: $999 (with five Client Access Licenses, or CALs)
• Windows Server 2008 Enterprise: $3,999 (with 25 CALs)
• Windows Server 2008 Datacenter: $2,999 (per processor)
• Windows Server 2008 for Itanium-based Systems: $2,999 (per processor)
• Windows Web Server 2008: $469
• Windows Server 2008 Standard without Hyper-V: $971 (with five CALs)
• Windows Server 2008 Enterprise without Hyper-V: $3,971 (with 25 CALs)
• Windows Server 2008 Datacenter without Hyper-V: $2,971 (per processor)