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Background Material
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Ico Analysis
The Forces of Light and Dark in Ico
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Active Sites
Team Ico Wiki - http://teamico.wikia.com/wiki/Team_Ico_Wiki
A recent wiki which is still actively being updated by its admin
Ico Forum - GameFAQs
Practically dead, but still the most active one around
Dying/Dead Sites
The ICO Repository - Web Archive (Functional)
Ico Flash - Web Archive (Mostly Broken)