All signs suggest that the traditional Dock Connector's days are numbered, but The Joy Factory is still shipping accessories for the 30-pin port. DuraLink ($20) is the company's four-foot Dock Connector cable -- a six-foot version is also available for $25. Unlike most cords, DuraLink is flat rather than rounded, which can reduce tangling issues. While not remarkable in concept, the basic version gives you an extra 12" of length relative to Apple's…