Like many of you, I'm addicted to Twitter. It's not just that I like knowing the real-time minutia of my friends' lives (sorry friends, you're all boring), but I like the idea of what Twitter can become. It's evolving in a free-form way, and there's no telling what it will be in the future. But right now people are learning to utilize it in very interesting ways.
The Tweet-a-Watt is one such example. Using a modified version of a $20 off-the-shelf wattage meter, the Tweet-a-Watt kit, now available online for $90, tracks daily power usage for an outlet. It then reports that information back to your followers via your Twitter account, including the daily average and your daily goal.
The kit includes the wireless transmitters and receivers needed to report the data, plus cables and various components needed to get it all wired up. It's the product of an open-source hardware project that had the main goal of wirelessly tracking power usage for a household. The Twitter aspect is a fun byproduct of this idea.