FireWire Depot has announced that they are preparing to release a new 2.5" hard drive enclosure with support for both FireWire and USB connectivity. Expected to ship in the middle of October, the new enclosures are also available with an external power supply. According to FireWire Depot:
2.5" combo FireWire/1394 hard disk drive enclosure
It is identical in size to the 2.5" enclosure on our website, except it has both FireWire and USB.
The SRP will be $150.00 (excluding external power supply, an additional $15.00) The kit includes the enclosure, a FireWire cable and a USB cable, CD, and manual.
You can find more information at the FireWire Depot web site.