At the start of its iPhone OS 3.0 event today, Apple announced a collection of statistics regarding the growth of the iPhone OS X platform, including: Over 30M Devices. Apple disclosed that 17 million iPhones and over 13 million iPod touches have been sold so far, for a total of over 30 million iPhone OS devices. App Store Countries. Fifteen additional countries are being added as App Store countries, bringing the total to 77. App Store Downloads.…