WinVPS2 launched last week and is utilizing x64 Windows, AMD Opteron Processors, and a RAID5 SCSI Array. It runs 64bit Plesk and 64 bit Virtuozzo for Windows 3.5.1.
Hardware Details:
Dual Opteron 265 DualCore
4x147GB U320 SCSI RAID5
8GB RAM
Windows 2003 R2 x64