I recently decided to reinstall OSX 10.5.6 and am using mechdrew's NetbookInstaller 3 method. Following the guide, I got to the 10.5.8 update and it locked up with 2 minutes remaining. I rebooted, but never got the grey screen with the progress bar(which I was expecting so that I could get into safe mode)
After several tries, I gave up and decided to start over. I reinstalled 10.5.6, and ran the Netbook Installer App. I rebooted and still didn't get the gray screen with the progress bar. All I get is the spinning cursor, then the gray screen with the Apple logo and round spinner.
I am able to run to 10.5.6 just fine, but am concerned about the 10.5.8 update, as I don't seem to have the option to get into safe mode.