For me MacMakeUp_1.95d works fine (Desktop machine, no wireless card, USB Bluetooth
dongle), I managed to change my MAC address without any hassle to 00-15-.... Just run the program, fill your desired MAC address and push CHANGE. That's all. For laptops: First disable Bluetooth and Wireless card (if there is Bluetooth card, not USB dongle). They have different MAC addresses than your LAN ...