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Apple USB Superdrive
In the pursuit of offering a device that is as thin as possible, Apple kicked the optical drive to the curb along with the Ethernet port.
Being without a CD or DVD drive on the MacBook Pro wasn't a deal-breaker for me, but I still use disks often enough that having a drive I can take with me is handy, hence the reason I grabbed Apple's USB Superdrive. Being no bigger than a CD case means that it is ultra-portable, and only needing a single USB cable for both data transfer and power means I don't end up with a huge kludge of wiring.
Image source: Apple.