Is it possible to get Java 6 running on a Mac PowerPC with Mac OS X 10.4? AFAIK SoyLatte is only available for Intel processors.
As of December 2009, a beta of OpenJDK 7 for OS X 10.5 PPC is available at http://landonf.bikemonkey.org/static/soylatte/ -- haven't tried it, and it's not quite what you were after, but it's the first I've seen so far of Java >=6 on any PPC OS X version! More details at http://landonf.bikemonkey.org/2009/12/index.html .