Easily connect your Thunderbolt-equipped Mac to a FireWire device with the Apple Thunderbolt to FireWire Adapter. Small and compact, it connects to the Thunderbolt port on your Mac computer, giving you a FireWire 800 port that supplies up to 7W for bus-powered peripherals like hard drives and audio devices.
You can get the adapter for $29 at the link below. Apple also sells a Thunderbolt to Gigabit Ethernet Adapter in their online store.
Read More [via Lee]