It may have gone un-noticed but VMware recently released Update 2 for vSphere 4.0 and vCenter Server.
The update primarily introduces additional hardware support:
- Fault Tolerance (FT) support for Intel Xeon 3400, Xeon 5600 and i3/i5 CPUs
- IOMMU support for AMD Opteron 6100 and 4100 CPUs
ESX/ESXi 4.0 U2 also introduces support for Ubuntu 10.04 as guest operating system.
The Update 2 for vCenter only introduces environment customisation for additional guest operating systems:
- Windows XP Professional SP2 (x64) serviced by Windows Server 2003 SP2
- SLES 10 SP3 and 11 (x32/x64 bit)
- RHEL 4.8, 5.4 and 5.5 Server Platform (x32/x64 bit)
- Debian 5.0, 5.0 R1 and 5.0 R2 (x32/x64 bit)