Just had to change some boot options on my PowerBook to get rid off a borked ubuntu-bootsplash (namely adding video=offb:off video=nvidiafb). When I updated yaboot in the process, I got the following:

liquid:~$ sudo ybin -v
[..]
ybin: Setting attributes on ofboot…
ybin: Setting attributes on yaboot…
ybin: Setting attributes on yaboot.conf…
ybin: Blessing /dev/hda2 with Holy Penguin Pee…
ybin: Updating OpenFirmware boot-device variable in nvram…

Well, if it helps..

I have two sound-cards in my XPC, one ICH5 onboard solution and a Terratec Aureon 5.1 PCI card. I have both enabled using the onboard solution for my headset and the Aureon for line-in/out. ALSA seems to assign the cards randomly (depending on the sequence the modules are loaded?) which results in having my audio-player’s ouput on my headset sometimes while I actually want it on line-out of my PCI-card. The ALSA FAQ to the rescue! Adding the index parameter to the options of the appropriate module within /etc/modprobe.d/options seems to do the trick:

options snd_cmipci index=0
options snd_intel8x0 index=1