Google senior VP and chief legal officer David Drummond has published an open letter criticizing the rush on patents in the mobile industry. "Android is on fire," he writes. "More than 550,000 Android devices are activated every day, through a network of 39 manufacturers and 231 carriers. Android and other platforms are competing hard against each other, and thatís yielding cool new devices and amazing mobile apps for consumers. But Androidís success has yielded something else: a hostile, organized campaign against Android by Microsoft, Oracle, Apple and other compan