Last night, with a bit of trepidation, I let my eee 901 hackintosh upgrade itself to MacOS 10.5.7. I’d been putting it off for fear that I might end up with a non-bootable machine (I could have recovered from it, but it would have been a pain).
As luck would have it, it mostly worked ok.
After reboot, the main problem that I had was that the monitor settings had reverted to 1024 x 768, causing the top & bottom of the screen to be cut off. Since the Mac menubar is at the top, this was a bit of a snag, but luckily I know the layout of everything pretty well, and I also had the advantage of Spotlight. Hitting Cmd-Space brings up the spotlight search box (in the right place, interestingly, even though the menubar was in the wrong place), and typing the name of an application allows you to launch it.
After a bit of experimenting, I ended up just re-installed the kexts from the EEE-Utilities package put together by Gregory Cohen. This seems to have sorted everything out.