Since this original post I have been accumulating a list of useful VMware ESX related tools that I have come across in my travels. I have now created a dedicated page on the TechHead site to these tools and their associated links. The TechHead VMware Tools page can be found here.
Now back to the original post… 🙂
Also, why not head over to vinf.net who has some good articles regarding running ESX within a VM (workstation and ESX itself!).