Interestingly made from recycled plastic with a unique flip-out video stand and slide-open protective door for the headphone port, Agent 18's new EcoShield+ for iPhone 4 ($40) is largely solid and opaque black or white with rubber button protectors on the left and top surfaces, and matching rubber grips on the sides. While you can use the speakerphone with the case on due to holes in its bottom piece, accessory use requires you to slide that piece…
