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.
Someone yesterday recommended SoyLatte for PPC (Installing Java 6 on Mac OS), and in fact these instructions seem to support his theory (read the comments where someone claims it works on his PPC): http://blog.adsdevshop.com/2008/02/26/installing-the-jdk-16-on-mac-os-x/
YMMV :-) Or try building from source. Again, YMMV :-)