According to post #325 in this forum thread, the TPM (Trusted Platform Module) for OS X 10.4.3 Intel has been cracked. 10.4.3 has a significant speed improvement over 10.4.1 (Up to 75% faster). It is rumored that a bootable installation DVD should emerge soon. Apple's TPM security doesn't seem to be working very well as this release was cracked within 2 weeks.
I will look for a copy online, if anyone wants to try this out on an machine they have kicking around. :)