For Tiger (10.4.x):
You can install X11 from your original Install Disc 1. Scroll down the Finder window which opens when the DVD is inserted; double clic "Optional Installs"; go through the license agreement and destination selection; on the "Custom install" page select Applications -> X11 and deselect everything else; hit Install. To see what this looks like, go here).
Alternately, you can download a version for PPC here, or Intel here. These files are able to be freely re-distributed because X11 is open source.
Notes:
Once installed, you should also update your X11 to version 1.1.2 here. This requires the earlier version, so you cannot just install the update.
A heavily improved version of X11 called XQuartz is expected to be available for Tiger some time in 2008. This will bring X11 on Tiger (10.4.x) into line with Leopard (10.5.x). See here for a roadmap of that project.
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