Mac OS X 10.5 Leopard was launched by Apple Inc. about one month ago.
OpenOffice.org, with the exception of the Java features will work on Leopard. If you require the Java features of OpenOffice.org on Leopard, you require to use milestone m237 or later.
The problem essentially boils down to the way that OpenOffice.org detects Java, and the fact that "Apple Computer Inc." is NOT the same as "Apple Inc.". (There are a few other build issues too.)
Thanks should go to Florian, Philip and Eric Bachard for their work on this issue.