This is very cool technology.
"For some it's the status of their portfolio, or the health of an aging parent. Others want to know if their friends are online, the upcoming weather, the score of a game, if the fish are biting, or if there's heavy traffic on their drive home. These are examples of information that is neither worthy of interrupt (push), nor worthy of investing time (pull). This type of information should be glanceable, like a clock or barometer. We call this ambient information, and we've created the technology to deliver it".
Thanks to Russell Davies for his recent post that got this on my radar.