There is many people that only Mac they had is PPC Mac. And they like them.
Some hints how to make for OSX 10.5 PPC (and even OSX 10.4 PPC) even with with OSX 10.6 Intel:
You find Xcode from every OSX installation DVDs and even OSX 10.2-10.3 installation CDs.
How to make PPC support for Intel Xcode 4:https://github.com/thinkyhead/Legacy-XCode-Scripts
Some official hints for compiling:https://developer.apple.com/library/arc ... -TPXREF101
And please if make new PPC version, make it for OSX 10.4 (Tiger), because most of PPC people like it more than OSX 10.5 (Leopard).