"It's also completely irrelevant; I'm disappointed that johill brought it up."
As long as you are not *surprised* someone brought it up. It is a rare occasion that a product using Linux is discussed on LWN without a sub-thread about the GPL and derived work.
Have there been any concrete court decisions in this field lately? I am tired of hearing peoples unprovable interpretations of a derived work. I would love to know what a derived work really is, but have searched far and wide with no solid answers.