on the region X site it says in big red letters that it only works if you have a region free dvd drive.
My old powerbook had a combo drive - CD writer, DVD read only. That was already region free out of the box!
My current powerbook has a superdrive (MATSHITA DVD-R UJ-825) and that is not region free, and it doesn't look like it easily can be made that way :-(
I think the firmware is apple-specific, so if I put PC firmware on I could stuff it up. look up your firmware on http://www.rpc1.org, if you can region free patch it, then you can do pretty much whatever you like with your dvds!