I've run into the same problem. No matter what I do, after leaving the GRUB menu I get a ton of panic messages and the install process halts. Also, the instructions I've found for installing OpenSolaris on Parallels are either too old to be relevant, or for some reason the writer didn't encounter this problem. I've tried installing 2008.11 on the latest version of parallels desktop (4.x) on both a Macbook Pro and a Mac workstation, both with the same results. I'd love to know how to get this working if anyone has pointers.