The Classic Star Trek Canon

We have a preliminary list of views on some of Classic Star Trek from http://delong.typepad.com/sdj/2007/01/classic_star_tr.html: which parts are canonical and which parts are obvious inferior forgeries:

Genuine and Canonical:

Star Trek II: The Wrath of Kahn
Star Trek IV: The Voyage Home
Star Trek VI: The Undiscovered Country

Shore Leave
Mirror, Mirror
The Enterprise Incident
Arena
The Devil in the Dark
Balance of Terror
The Trouble with Tribbles
The Changeling
A Piece of the Action
Charlie X
A Taste of Armageddon
The Menagerie
Space Seed
The City on the Edge of Forever
Amok Time
The Omega Glory

Possibly Canonical, but Subject to Dispute:

The Gamesters of Triskelion
Star Trek: The Animated Series, various episodes

Definitely Heretic:

Spock's Brain (The Rex Momus heresy)
Star Trek I: The Motion Picture (The Bruce Moomaw and Jacob Levy heresy)
Star Trek III: The Search for Spock (the Stoffel and Bruce Moomaw heresy)