LunaC - 7:31 am on Jul 7, 2011 (gmt 0)
I'm not sure I'd go with a 410 either. I may be panda paranoid but wouldn't saying they're 'gone' imply they had existed at some point and also be sort of adopting them? Or am I misunderstanding the difference between gone and not found?
Personally I'd leave it a 404, or better yet the way g1smd is doing it to catch any real traffic. (g1smd, are you willing to share that script? I'd love a copy :))