I'll update this sometime in the future, but here's a general outline:
1) Provide constructive criticism and offer help to a deck. (haven't seen this as much of a problem)
2) Explain what sort of deck it is either in the title or first few lines of the post. (again, not much of a problem)
3) Don't do anything to just push your deck down (prevent peeking to see what its about when you hover over the thread title.)
4) Do state what format your deck is. (Yu-Gi-Oh!: Advanced vs Traditional, Magic: Type 1 vs Type 2, etc.)
***To make sure everyone here reads the rules, any thread not following any of the above will be closed on the spot.
Count-down to section-wide clean-up:
(countdown started at 7)