AlthoughIntel has been trying to obsolete the PCI bus in recent times with the Sandy Bridge desktop platforms not supporting the PCI bus natively, there are still an absolute ton of PCI slots available in the installed base and adding a PCI Gigabit Ethernet adapter is a very common use these days.
Here is the VMware ESXi HCL for the Intel Pro/1000 GT. It does not include ESXi 4.0, at least out of the box. One can use additional drivers found here to get them to work with ESXi 4.0 if the card is not recognized out of the box (some people do not need this step and it installs with the e1000 driver.) Many people are having issues with the cards dropping and I will say my experience has been hit-or-miss with the cards and a quick Google search finds similar experiences. I tend to be fairly conservative with talking about hardware support so if something is not on the HCL and I have personally not had perfect experiences with it, I tend not to recommend it.
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