VMware released VMware ESX3.5/i Update 4 on March 30th. The release notes for ESX 3.5 can be found here. The release notes for ESXi 3.5 update 4 can be found here.
A small summary of the updates is that the OS support has been increased. Also the VMXNET network driver has been optimized (which requires VMware Tools to be upgraded on the VM’s). And a lot of CRITICAL updates. Make sure to check it out.
