Mac OS X on a Thinkpad T60p...?

I'm sure you've already seen the following after your extensive searches...but just n case:

System requirements
Apple states the following basic Leopard system requirements, although, for some specific applications and actions (such as iChat backdrops) an Intel processor is required:[38]

Processor must be any Intel, PowerPC G5 or G4 (at least 867 MHz or faster)
DVD drive (for installation of the operating system)
At least 512 MB of RAM (additional RAM (1 GB) is recommended for development purposes)
At least 9 GB of disk space available
Leopard's retail version was not released in separate versions for each type of processor, but instead consisted of one universal release that could run on both PowerPC and Intel processors.[24] Leopard drops support for slower G4 and all G3 processors.[38] Versions of Leopard shipping with computers, however, were Intel only, as is Apple's entire Mac product line.


[edit] Usage on unsupported hardware
Some ways of running Leopard on certain unsupported hardware, primarily slower PowerPC G4 computers, have been discovered. A common way is use of the program LeopardAssist, which acts as a bootloader on the unsupported hardware, similar to XPostFacto.[39] Currently, LeopardAssist only runs on slower G4s and many people have installed Leopard successfully on these older machines.

Users who have access to supported hardware has installed Leopard on the supported machine then simply moved the hard drive to the unsupported machine. These are mostly G4-based computers. Owners of G3 computers have tried to run Leopard with the same method as above. However, most of the time, the computer would crash, although there have been successful attempts at running Leopard on late G3:s (mostly 800 MHz iBooks)the system was not very stable.