Thank you for the links, Michael!
And for moving the guide where it can be updated - I ran into the same editing, or rather lack of ability to continuously edit, issue earlier.
Anyway, here are the issues I am currently experiencing while running Snow Leopard in the (currently) latest version of Parallels Desktop, Build 7.0.15094 (Revision 749908; April 5, 2012):
1) Sound does not work
I tried all different settings in Parallels, the status is "Connected", but in Snow Leopard the Sound system preference pane shows no input/output devices.
2) Unable to share my Mac (Lion) drives with Parallels
"Sharing" under "Options" in Parallels is set to share all disks, "SmartMount" is checked, and I even added my drives (2 partitions on one drive, one is my Lion boot partition, the other is just a data partition) as custom folders. Still, no drives or folders show up in VM.
3) Issues with "Boot order"
In Parallels, I created a second, backup, hard drive to use for booting for restoring the “ServerVersion.plist” file onto my main drive, after removing it to use the Software Update (and the Sharing preferences if that gets resolved). I have not yet imlemented the script you mentioned. When I do, perhaps this will be a moot point, but until then... I used SuperDuper! to clone my main drive to the backup drive.
I have the following order in the "Boot order":
Floppy Drive
CD/DVD
Hard Disk 2 (backup)
Hard Disk 1 (main)
"Floppy Drive" is mapped to the virtual drive provided by Parallels, while "CD/DVD" is mapped to my Mac's optical drive, which has nothing in it.
If the "Floppy Drive" and "CD/DVD" are checked in "Boot order" and "Connected", (sure, I'll never need the "Floppy Disk" and will uncheck and disconnect it for normal use, but... for the sake of troubleshooting), the VM boots from the main drive, even though backup is listed first.
If the "CD/DVD" is unchecked and if the "Floppy Drive" is disconnected, whether checked or not, VM boots from the backup drive no problem. With the "Floppy Drive" unchecked or disconnected, the VM boots from the backup drive only if the "CD/DVD" is unchecked -- disconnecting it does not solve the problem, as it does with the "Floppy Drive".
Using "Select boot device on startup" didn't work at first either -- the VM always booted from my main drive, even after manual selection of the backup drive, but after I deleted the main drive, created another, cloned the former backup to the new backup, renamed the former backup to be the main drive, I can boot from the new backup drive. Perhaps a glitch fixed by repeating the process?! So, currently, "Select boot device on startup" works, while the "Boot order" configuration (without "Select boot device on startup") does not. However, I did notice that on the boot selection screen, the main drive is listed before the backup drive (makes sense, it was created first, if that's how it works) and if I don't choose the backup drive (even though it's listed as first in the "Boot order"), the VM boots from the main drive. This seems like a Parallels issue, but I can't verify it without someone else replicating these steps on their system.
I was having additional issues -- crashing System Preferences after deleting the "ServerVersion.plist" file, being unable to boot from the backup drive after deleting the same file on the main drive, but it seems these issues went away after I deleted the offending main system/drive, created a new drive, and cloned the backup to create a new backup. I don't know why this worked (the backup was after all identical to the main), but it did. However, the above-mentioned issues remain.