Market's Up Stock Notification
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The Market's Up notification provides a simple way to get index performance without having to open other apps such as Google or Yahoo Finance. In fact, you can see how the market is doing without even unlocking the phone as the notification will be readily visible from the unlock screen. No need to flip over to CNBC every few minutes, Market's Up keeps you constantly up to date.
A lot of effort went into this app for battery conservation. Though it may show up in a task killer, it is only checking the markets every 15 minutes during market hours. The notification update is configurable through the settings.