It isn't a bubble, since Bitcoin has stayed at a constant mean. Yeah, it has soared up and gone down every now and then, but it has, on average, gone up its expected route. If it continues at this pace, by the time bitcoins become a very popular internet currency, they'll be worth thousands a piece. (One fellow said he calculated if they match USD in value, they'll actually be worth roughly 550 million a piece, but let's not get ahead of ourselves here).
Worse comes to worse I lose some money on my electricity bill. Big deal.