ESX 3.5 Works in VMware Workstation 6.5 beta2:
Those guys at the Xtravirt site (along with a lot of input from the VMware Community forums) have a VERY NICE document detailing how to get ESX 3.5 and virtual machines running now in the VMware Workstation 6.5 beta 2. Very valuable for study and demos.
Xtravirt was the first people to figure out how to do this before with VI 3 but the functionality broke with Workstation 6.5. VMware has decided to put the functionality back in Workstation 6.5 due to popular demand.
Get the whitepaper here.