Although development boards, like Beagle Board and Arduino, have been in existence far longer than it, the Raspberry Pi ushered in a revolution by bringing down the price without compromising (too much) on features. Plus, it has been committed to open source and open hardware from the get go. Now it's trying to do that magic again, but this time in a new form factor. With the popularity of HDMI PC sticks, it's not surprising that the new Raspberry Pi Zero would come in that size. What's surprising, however, is its $5 price tag.