USB stick, the outfit has officially pulled the software. Apparently there have been a few "questions arising regarding the fair use of a particular file present on the aTV Flash, and conflicting opinions as to whether or not it falls under the fair use category." In order to keep itself off of the hot seat, it has "proactively" (and voluntarily) discontinued offering the product "until further notice." Not all hope is lost, however, as Apple Core is currently working with the party in question to resolve the dilemma, and it should be keeping us all in the loop as discussions progress. Oh, and in case you're curious -- all current orders were canceled and refunded.
[Thanks to everyone who sent this in]