Richard Garsthagen, Technical Marketing Manager at VMware, just published some useful tricks for ESX Server 3i beta that VMworld 2007 attendees received in a nice 1GB USB key.
So, after running ESX Server 3i in a Workstation 6.0 virtual machine, you now can get a command line (despite 3i is supposed to not have a command line), customize the logon screen and reset the pre-configured root password.
Read the whole post at the source.