Branden's notes also apply to the new Titanium PowerBooks (at least for the 550...I'm sure 667 is the same in general since most of the hardware is unchanged between the two). So, installing on a new TiBook should follow the same procedure.
Nice work on the docs, Branden...very thorough :-) FYI, you can also add 'enablecdboot' to your /etc/yaboot.conf to enable a prompt from yaboot to boot off of CD. C