Brugh posted a nice "VA" on the Virtual Appliance Marketplace. EDA is an appliance dedicated to deploying ESX servers fast and easy. It has a scriptbuilder to quickly create %postscripts.
ESX Deployment Appliance (EDA) is a small and easy to use appliance that makes deploying ESX servers a breeze. It has a very intuitive web-interface that can configure and deploy dozens of ESX servers in minutes. It has a script-builder that will allow any admin to create %post-scripts that will do most anything one needs to get the ESX hosts up and running! Even if deploying with RDP/Altiris or the UDA, this script-builder can help setting those up very quickly.
To set it up, just attach a ESX3 iso to it. It will automatically mount it and with one click, import the PXE bootfiles and strip the HBA drivers to do a save install while SAN LUNs are attached!
This appliance is still in beta stage because there's a todo list. But it's fully functional and has been tested to work at least on HP DL380's, BL460, BL480 and Dell 2950 servers.