Pretty elitist attitude if you ask me. Tiger would run on G3 PB's Firewire addition w/DVD(newworld bios?), seems as though other than later G3 support that Tiger and previous versions had, there is nothing specifically keeping them from allowing it to run on a Pismo, as most people with Pismo's already have 256MB or more RAM, T-book G4's @400Mhz had same bus, memory speed as the Pismo, so it's kind of crappy they aren't officially supporting them. Doubt it has to do with the GPU either, and maybe we'll find out that without supporting it, the installer will not prevent you from installing it. If not, then a hack will be needed...XPostFacto I suppose. I did not upgrade to Tiger, because it wasn't interesting enough, but I'm sure there are plenty of G3 owners with systems that are spec'd at the same level as the 1st gen Ti-book who will be disappointed.
Oh well, we have to upgrade someday, and many apps are now starting to be Intel only, so we're soon to be screwed one way or another, lol.