Hi there - just a note that I couldn't get either the Universal installer or the PowerBook Titanium 1 Ghz installer to work on my 1GHz Titanium Powerbook - the Titanium installer would boot but refused to install, saying that it was the wrong computer for the installer.
I ended up putting the Powerbook into target disk mode and copying over the "Just Format & Drag files to Install" image which worked fine.
One possible reason was I burned the images to DVD instead of CD (didn't have any CDs handy). This didn't affect booting up off the disks but it's the only reason I can think that may have caused the installers to fail (assuming they're 'known good').