Even if it weren't illegal, we are rapidly entering an era where it won't be practical anyway: I work directly on these issues--participating in the DMCA exemption process every cycle and serving as a witness during the hearings--and the whole process just feels kind of dumb knowing that "sure, so let's say it is legal to jailbreak your tractor: they still have to make a mistake in a world where bootloaders are becoming increasingly reliable" :(.