Saw some interesting speculation regarding the Osterhagen Key on one of my Yahoo lists - thought I'd post it here for discussion.
Osterhagen Key - Facts:
> The Osterhagen Key is a small, flat, square object.
> The Osterhagen Key resembles a digital storage disk.
> The Osterhagen Key was given to Dr Martha Jones by UNIT.
> Former Prime Minister Harriet Jones ordered Martha not to use the Osterhagen Key.
> Captain Jack Harkness of Torchwood, normally knowledgeable about even the most Top Secret matters, did not know what the Osterhagen Key was.
> Osterhagen is a Norweigian surname, Bad Wolf Bay is also in Norway.
> Osterhagen was a forced labour camp run by the Nazis in WWII.
> Osterhagen translates from German to English as 'burning man'.
> Osterhagen is an anagram of 'earths gone'.
> Osterhagen is an anagram of 'a three song'.
> Anagrams are a recurring theme in the new Doctor Who. Perhaps 'earths gone' is a refence to somekind of planet-wide self-destruct mechanism. The Osterhagen Key could be a last ditch attempt to destroy an enemy that is about to destroy the Earth.
>
> So far the comments below have suggested 6 possible meanings to the Osterhagen Key.
> Osterhagen Key could be a component in a time-weapon capable of erasing people from all of existance, similar the Demat Gun in the classic series episode 'The Invasion of Time'.
> Osterhagen Key could be a planetary self-destruct mechanism to be used against an unstoppable enemy.
> Osterhagen Key could be a digital storage device used in conjuction with Project Indigo to 'save' the whole of humanity on disk to be salvaged later.
> Osterhagen Key could be time-travel/ manipulation device.
> Osterhagen Key could unlock the time-locked First Great Time War, allowing the events and/or outcome to be changed.
> Osterhagen Key could be related to the Master's signet-ring which is thought to still contain his essence.
Thoughts?