In the last few pages of that thread they are talking about wiimote and sixaxis connectivity ... now OS X has been added to the list.
I seriously doubt that it would be THAT hard to code drivers for these things. Unless they are using some crazy band of bluetooth that the axim bluetooth cannot see? Is that even possible.
I've been thinking about attempting to do this myself. I've got a bunch of experience writing software in windows and some low level machine stuff as well. My biggest uncertainty is getting enough time to delve into this. But still - it would be interesting and I MIGHT have some free time over the holiday...
I'll at least take a close look at the work done to connect sixaxis to windows and maybe do a little research into bluetooth too.