I was perusing Jeff's collection thread and came across a little back-and-forth between Jeff and Simon about the limited edition of Kingdom of Fear (Jeff's copy has a blue slipcase while Simon's - and I think all other copies I've seen - has a red slipcase. My copy has a red slipcase as well).
I have a different question though. My copy is a Presentation Copy. How common are these? (I might be interested in selling it, by the way).