- Windows Server 2008
- Windows Server Update Services (WSUS) 3.0
- VMWare Server 2.0 (aside from beta stability issues, fantastic)
- SQL Server 2005 (just a wonderful database and a great interface)
Honorable mentions: Because I "like" them but I find them difficult to "love"
- System Center Configuration Manager 2007
- SoftGrid / aka Microsoft Application Virtualization 2007