SUSE 7.3 package comes with a whopping 8CDs, printed docs, and a whole lot of applications. Wanna run Mac within Linux? Covered. Wanna find out what the Gimp is all about? You can do that too. One great use of Linux, however, on older Macs is the ability to run a super-quick apache web server. If you have a static IP address, you'll be all set with an excellent server you can administer yourself for the right price...
For the price, it makes a mighty fine value, especially compared to the up and coming Mac OS X, which simply doesn't run on older PPC macs.
One piece of advice--- SUSE Linux PPC will only run applications that have been compiled for PPC... with that in mind, you'll only have thousands of apps to play with, not the whole linux library out there.