Footage for this video of the Ducati Multistrada at this year's Pikes Peak hillclimb was captured using the iPhone 4's built-in camera. (The on-the-bike segments come from helmet-mounted HD cameras, not the iPhone.)
The Hell for Leather motorcycle site says the iPhone video was made using an Owle Bubo accessory.
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http://filmtools.wordpress.com/2010...e-housing-includes-camera-mount-lens-and-mic/