Krypton has introduced its new Flex Case and Screen Armor accessories for the iPhone 3G and iPhone 3GS. The Flex Case is a form-fitting silicone case for the iPhone 3G and iPhone 3GS offering push-through protection for the power and volume buttons, open access to all other ports and controls, and one of four graphic designs on the rear. It sells for $30. Krypton’s Screen Armor is a series of film screen protectors offering non-sticky application,…