Fresh from its takeover of Sanyo, Panasonic has unveiled plans for a Lithium storage battery that will be able to power the gizmos in your home for a whole week. As well as giving life to your gear if your wind turbine/solar panels/platoon of cycling gnomes in the basement packs out, the battery will allow you to monitor your electricity usage via your TV.
I am, however, assuming that when Panasonic says it can power a house for a week, it's talking about a Japanese house, rather than one Stateside. The battery will be available in 2011, so keep those gnomes a-pedalling until then. That is, if they're in your home for pedalling — they might be delivering presents.