I finally got a 10.5.8 install to transition from DellEFI to NBI 0.8.2 but it took more work than listed for me to get things to work.
I did the following:
1) Recreated my install DVD key with NetBookMaker.
2) Used that key to boot into the first page of the OS X installer but never ran the installer but just used NBI from the Utilities menu.
3) Rebooted once again using the OS X installer but then pressed space to change boot discs and booted the internal drive using the "-x -v" flags to boot into safe mode and also to see if the were any issues during boot.
4) Ran NBI on the internal disc
5) Opened terminal and turned off hibernation (although I picked NBI to disable it didn't seem to take), remove the /var/vm/sleepimage, removed /dsdt.aml file.
6) Rebooted normally (i.e. no special boot flags) using internal drive and used the bootloader on the internal drive.
7) Reran NBI yet again
8) Opened terminal, deleted /S/L/Extensions.mkext, sudo chown -R root:wheel /S/L/E/*, sudo diskutil repairpermissions /
9) Rebooted and life was now good.
* Each time I ran NBI I selected: to install the bootloader, mini kexts (including mirror friendly driver since I do run an external monitor), create/recreate dsdt.aml file, enable remoteCD, disable hibernate, fix bluetooth.
Things I encountered:
A) If I ran NBI in either safe mode or normally on my internal drive I got stuck at the blue screen no matter what I tried and I restored and tried a number of times. Only when I started with the bootloader created by NBM on my OS X Install USB stick did I get past my first hangup. I think it could be releated to the 'old' DellEFI created /dsdt.aml file. If that is the case NBI 0.8.3 is supposed to take care of that.
B) Running NBI in safe mode once I could actually boot didn't seem to really get things right. I had no driver for the display and was stuck at the VGA 800x600 screen res. Trying to just run it without being in safe mode got me an unbootable drive, stuck at the apple logo, never moving past. It was only when I booted into the OS X install USB stick did I start to make progress.
C) Deleting /S/L/Extensions.mkt, the chown and the running of diskutil forced a rebuild of the kext cache. This was perhaps the real magic that got everthing to work properly.
I offer this long post as just food for thought for those that have had problems with trying to convert good working DellEFI installs into NBI installs. I'd suggest trying the much simpler official process from the first post of this thread first.
Mini1: Vostro A90, Black, 2G, 1.3 Webcam, Bluetooth, 64G SuperTalent, OS X 10.6.4
Mini2: Mini9, Black, 2G, 0.3 Webcam, Bluetooth, 32G RunCore, OS X/Win 7, internal PCI-e SHDC Reader
Mini3: Mini10v. Black, 2G, Webcam, 640G HD, OS X 10.5.8/Win 7/Ubuntu [Hibernate w/NBI 0.8.3 RC4] Dropbox Referral