Below are a number of example industry documents of interest:
General Documents
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Eidos Game Submission Checklist - What one publisher is looking for in a proposal.
Proposals and Concept Documents
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Chaser 2 - A game concept document.
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Amazing Adventure Proposal - A game proposal.
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Power Babes Proposal - A game proposal.
Game Design Documents
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Baldwin Game Design Document Template - A template to help develop a game design document.
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Chris Taylor Game Design Document Template - Another game design document template by Chris Taylor.
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Catalyst Wars - An example Game Design Document
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Sub Hunter - An example GDD.
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Doom Bible - The Doom Game Design Document
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Project Chesterfield - Another Game Design Document
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SPECTAC: Overflow - Still another GDD.
Other Planning Documents
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C++ Student Coding Standards - Coding standards for students to use.
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A Music Design Document - The music 'design document' written by Joss Whedon for his movie Serenity. It's a great example on how a designer (or director) can communicate to his composer.