A reader of my Blog pointed my to the Digital DJ Blog. He has found a way to fix the "Unknown CPU" problem. Editing the file "/System/Library/CoreServices/Resources/English.lproj/AppleSystemInfo.string" is only cosmetic. For the OS the CPU is still "Unkown". His solution is a kernel extension, which injects a "cpu-type" property into the IORegistry. Read the blog for more info about this topic.