Backstab (General, Fighter)
Prerequisite: Combat Reflexes
Benefit: Once per round gain AoO against Flanked Enemy who doesn't attack you.

Canny Opportunist (General, Fighter)
Prerequisite: Int 13, Dex 13, Combat Expertise
Benefit: You Can make an AoO whenever an opponent you threaten draws a weapon, readies or loosens a shield, or attempts to Feint in combat.
You may make AoOs when Flat-footed.

Defensive Opportunist (General, Fighter)
Prerequisite: Int 13, Tumble 5 ranks, Combat Expertise
Benefit: AoOs do not suffer from the Fighting Defensively penalty.

Exploit Adjustment (General, Fighter)
Prerequisite: Int 13, Canny Opportunist, Combat Expertise
Benefit: You may make AoOs against any opponent who moves from one square adjacent to you to another square adjacent to you.
Normal: 5 foot steps don't provoke AoOs.

Occult Opportunist (General)
Prerequisite: Knowledge(Arcana) 5 Ranks, Spellcraft 5 Ranks
Benefit: You may make AoOs against a threatened opponent who dismisses, directs, or redirects an active spell; who casts a quickened or swift spell; or who attempts to turn or rebuke undead.

Opportunist Tactician (General, Fighter)
Prerequisite: Dodge, Mobility, Combat Reflexes
Benefit: You may make a free 5 foot step after an AoO as long as you can actually make one.

Sneak Attack of Oppurtinity (General)
Prerequisite: Combat Reflexes, Sneak Attack +3d6
Benefit: Your first successful AoO of a round also deals Sneak Attack damage.

Two-Weapon Attack of Oppurtinity (General, Fighter)
Prerequisite: Dex 17, Two-Weapon Fighting, Combat Reflexes
Benefit: If you are wielding two weapons and make an AoO you may use both weapons to attack. You may not exceed the number of AoOs you are allowed in a round and using this feat takes up 2 such attacks. You still suffer normal TWF penalties on such attacks.
Normal: You may only use a single weapon with AoOs.

Improved Combat Reflexes (General)
Prerequisite: Dex 13, Combat Reflexes, BAB +6
Benefit: For any AoO you may make 2 Attacks. The 2nd attack is at a -5 penalty like your normal 2nd attack. You may not exceed the number of AoOs you are allowed in a round and using this feat takes up 2 such attacks.

Greater Combat Reflexes (General)
Prerequisite: Dex 15, Improved Combat Reflexes, Combat Reflexes, BAB +11
Benefit: For any AoO you may make 3 Attacks. The 2nd attack is at a -5 penalty and the 3rd at -10 like your normal 2nd and 3rd attacks. You may not exceed the number of AoOs you are allowed in a round and using this feat takes up 3 such attacks.