Prisoner's dilemma on £100.000

Dup: http://news.ycombinator.com/item?id=902195

Much discussion already there, but comments no longer possible, so if you want more discussion, I guess it has to be here.

And the other item has spoilers, so if you want to watch it before knowing the outcome, do so here.

This comment is also a spoiler protector, but only if you up-vote it to keep it at the top. If you don't want me to get karma for that, here's a link to a scapegoat comment to down-vote, and hence balance the karma:

http://news.ycombinator.com/item?id=1020472

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Scapegoat comment ...