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HotPad is a simple web app that "overclocks" your iPad's CPU, and displays virtual heat coils on its screen, where you can place your coffee and keep it warm for hours.
Of course, it's all a joke, and we definitely don't recommend you placing any hot beverage on your iPad (or any other gadget, for that matter). The app is a clever take on the recent iPad heat controversy - Heatgate, if you will - in which a slew of reports claim that the new iPad is heating up considerably more than the iPad 2.
The app was concocted by the pranksters at Primary Coffee Company, which claims that the "app" won't hurt your iPad, but placing coffee on it might.