We depend upon our cables so much yet pay very little attention to them. At least until they fail. I plug and unplug my iPad so much, to ensure it is always charged, that my cable started to fray and fall apart. I could replace it with another identical cable, but for under $20, I figured I'd rather have the DuraLink from the Joy Factory.
The aptly named DuraLink is rugged from tip to tip, USB to 30 pin, and all along the 4 feet in between. They offer longer and even very short cables, great for traveling. The cable is made of a flexible, durable material that resists tangling and just feels superior.
If you need a cable, either as a replacement or a spare, consider upgrading to the DuraLink from the Joy Factory.