Gave the trial of
GetFLV a try, and the method it seems to use is switching up the feed, so you'll get the rick roll in the browser window and getflv will download the actual file. But it doesn't always work, and was very buggy on my windows 7 machine.
I don't know if the full version would be less buggy, can anyone verify this?
And, yes, where can this lurk4 program be acquired?