Well, I just installed Leopard and dared to try this kernel extension, and actually to my surprise, it worked fine! I didn't test all key remapping options, but it worked perfectly for my purposes of remapping my PowerBooks 'enter' key to be 'option'. So yea, I'm on a 1.67Ghz G4 PPC PowerBook, I guess it's possible there could be an issue with Intel Macs, but I wouldnt know. I'M GLAD THIS STILL WORKS! Thank You!