My experience : a nightmare and at last, the dawn...
I had this Dell Mini 10v netbook, with A06 Bios.
I did'nt want to downgrade BIOS (a real PITA in my opinion) although I just couldn't get from 10.6.0 to at least 10.6.6 (which was all I needed to make Evernote and the software I work with launch correctly).
I spent 3 days trying to perform the update with the 3 versions of NBI : 0.8.4 RC, 0.8.5 Pre and NBI2020100616212351.
I followed the guides explaining how to copy Snow Leopard's original DVD to a USB stick, then update the stick with NetbookMaker and then installing the Combo Update to 10.6.6.
During 3 days and nights, I just got the blue screen of death, or the endless multicolored wheel, etc.
Everything was fine with 10.6.0, but I couldn't get near 10.6.5 or 10.6.6.
Then I tried a different approach.
I decided to use the combo updates, one step at a time.
I got to 10.6.1, then 10.6.2, 10.6.4 (I skipped 10.6.3 and 10.6.5, I was tired) and 10.6.6.
during that "odissey", I lost the ability to open .dmg files, but with another mac I could, so I copied directly the .pkg files to the netbook and I could perform every update.
I only used NBI...2351 and though I sometimes lost Wifi or sound, after the next combo update, everything finally worked.
I respected the rule : combo update with **no reboot**, ran NBI....2351, reboot, run NBI again, reboot.
then, next update, and so on.
Everything works for me*!
I hope it'll help someone...
Have a nice day