I think that your device tree is something like this, right?

disk0s1 --->tiger (default boot)
disk0s2 --->Leopard

In the rev1 you must activate the partiton manually and in your case Darwin is intalled from the tiger partition not from leo....

fdisk -e /dev/rdisk0
update

f 2

w (y)

q

cd /usr/standalone/i386

./startupfiletool -v /dev/rdisk0s2 ./boot