Its thought that a huge number of RROD returned 360s are killed by household surge protectors, so i'd be careful with it. I unplug mine whenever i se lightning under the vicinity, because i will go mad if my xbox is away over late september. I've become paranoid - i play a fan over it and leave it in plenty of space standing upright to prevent the GPU overheating...
btw, not using ur PC during a storm of the epic proportions worth posting about even if it has a virus is a good idea - i dont know much about viruses but i presume the damage it does is to ur data, ie ur hard drive, and therefore the CPU & motherboard is reusable... but wont be if they're fried.