I really like the features offered by the Turnkey solutions! Thanks folks. However I've run into a problem.
I installed the Revision Control Appliance 11.0RC to a VM using VMWare Player (running on Windows 7) and made a few tweaks  and tested. Works great! Then I used VMWare Converter to convert and copy the VM to our VMWare ESXi 4.1  server. Alas, the VM doesn't boot under ESXi - it either kernel panics or drops me to a busy box terminal .
I also tried converting to VMWare Server 1.0.9. This also failed, though it always failed straight after grub finished its countdown 
Finally, the Turnkey install iso also fails to boot under ESXi - it gets to the install menu but shortly after I select "install to hard disk" it fails with a "General error mounting filesystem" . Has anyone successfully installed this ISO to a VM hosted in ESXi?
It's worth noting that the regular Ubuntu 10.04 install iso installs fine under ESXi.
There seems to be something unusual that Turnkey is doing that causes grief with ESXi. But I've been investigating the problem for a long time now - is anyone else having these sorts of problems?
BTW, the 2009.10-2 VM runs fine but I'm interested in using Mercurial and the version there is ancient.
Any help would be really appreciated!
 Specifically, I added another virtual hard drive and mounted it at /srv/repos to store the repositories in a separate vmdk.
 Technically, "VMware vSphere Hypervisor"
 Grub does the usual countdown, the kernel is unpacked and begins booting but it looks like some issue with the hard drive causes problems. Can't give text output from ESXi's console but see attached images: turnkey_vm_busy_box.png and turnkey_vm_kernel_panic.png
 I'm not particularly surprised at this as the last Ubuntu version supported under Server 1.x was the 6.x release. It's likely a grub2 issue(?).
 See turnkey_iso_boot_fail.png.