Currently the only Macs to use the 64-bit kernel are the Xserves! Why can't apple fix this? They don't care to fix it. They dont want to bother writing drivers for all thier hardware (WTF -it is not that much hardware). Yes you read that right. Your brand spanking new MBP will use a 32-bit kernel as default. You can force 64-bit kernel but some of your hardware will not be working (Nice -WTF). So all that marketing crap about the benefits of 64-bit etc are all B.S. I don't want a million threads about how this will not effect the running of 64 bit apps, etc. because it will. Your 64-bit app will run but it will not be able to address more than 4Gb of RAM. There are also many more advantages to having a 64-bit kernel.