Apparently made by Pixela. Note that some of the resellers say "not Mac compatible," but I suspect from the context that the problem is with drivers or the accompanying software that converts the files, not with the basic cable itself; or, certainly worth someone conjuring up a Mac OSX driver!
Here's the basic link to Pixela:
http://www.pixela-1.com/captycable/
and to another reseller (minus the software, but similar price):
http://www.usbfirewire.com/Parts/rr-527950.html
and to a .pdf brochure (notes, again, "not Mac compatible") from the second source:
http://www.usbfirewire.com/brochures/USB.USB.To.FireWire.pdf