Filmmaker Jesse Rosten has put together a humorous and well-produced video showing what happens when Velcro is affixed to the back of an iPad. The less-than-2-minute clip shows the iPad being attached to a car dashboard, wall, window, stove, ceiling, and even the top of a motorcycle.
Of the bunch I'm the most intrigued by the application on the car dashboard, which can provide a simple (albeit unsightly) way to use the 3G version as a viewable GPS unit. It's certainly cheaper, and less permanent than.
See also my CNET colleague Dan Ackerman'sthat uses 3M's command adhesive-powered hooks.