Like Belkin, Griffin has developed a Headphone Adapter for iPhone ($10), designed to allow iPhone users to connect any pair of headphones or earphones they may already own to the slightly recessed, thinner-than-normal headphone port on iPhone's top. The Headphone Adapter will be sold in white or black versions, each with gray accents, and will also be available as a $15 bundle with the company's earlier SmartShare Headphone Splitter with Volume Control.…
