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Accelerometers are increasingly being incorporated into personal electronic devices. Some smartphones and personal digital assistants contain accelerometers for user interface control. Prominent examples include the Samsung Omnia, Nokia N96, Nokia 5800, Sony Ericsson W910i, the Palm Pre, Blackberry Storm, HTC Touch Diamond, Apple iPhone, the Apple iPod touch, the Apple iPod Nano 4G, the Google G1 and the new Microsoft Zune HD, scheduled for release in the fall of 2009.Gaming devices like the Wii Remote  for Nintendo's Wii game console contains a three-axis accelerometer from Analog Devices to sense movement which complements its pointer functionality. This provides more realistic game control.
Unlike a real bubble I think it could be susceptible to accumulated error and could drift.(...sorry, you cannot view external links. To see them, please
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More's to the point, why would one desire a spirit level in an Ipod? Is Apple trying to emulate the Swiss Army knife with an electronic version. I have never found anyone who genuinely uses a Swiss Army knife except for the knife blade.
... why would one desire a spirit level in an Ipod?