Why would you need an extra Thunderbolt cable? Lots of reasons. For example, did you know you can connect a Thunderbolt MacBook Air to an iMac with Thunderbolt, and press Command-F2 on the iMac’s keyboard, and you’re instantly using its display as an external monitor for the Air? And as more and more Thunderbolt hard drives and RAIDs hit the market, they don’t always come with a cable. StarTech offers quality cables at 0.5 meters, 1m, 2m (all $48.99), and 3m ($89.99), while Apple’s own Thunderbolt cable only comes in 0.5m ($29, www.apple.com) and 2m ($39).