It appeared and disappeared a few times over the first day of supposed availability, but now it seems to have arrived for good: the Thunderbolt to FireWire 800 adapter originally announced with the most recent laptop refresh is now on sale.

The adapter works with all Thunderbolt-equipped Macs and supplies 7W of power for bus-powered devices. Given the theoretical bandwidth of Thunderbolt far outstrips the FireWire spec, the adapter should have no problem keeping up with the fastest drives.

Thanks to Eric J