Every couple of months, this very same thread is started by someone new. We should ask the mods to sticky a permanent list, a la Phil Reed's Future d20 products list above.
Speaking of, I post this tree in every such thread, and I shouldn't skip this one:
Intimidation talent tree
Brute
Some people don’t need a strong force of will to intimidate people; their natural toughness is apparent to those around them. A Hero who takes Brute adds his Constitution modifier to his Intimidate checks.
Prerequisite: At least one talent from the Unbreakable talent tree, Intimidate 6 ranks.
Take It Like A Man
Once per combat, whenever the Hero takes damage from a successful attack, he may spend one action point to make a free Intimidation attempt against his opponent. The Hero adds the damage taken from the attack as a bonus on his Intimidation check.
Prerequisite: At least one talent from the Unbreakable tree, Intimidate 10 ranks.
Demoralizing Attack
The Hero may spend one action point to make a single melee attack as a full round action. If the attack is successful, it deals only nonlethal damage. The Hero may then make an Intimidation attempt against his opponent for free, adding the damage from the attack as a bonus to the Intimidation check.
Prerequisite: Base attack bonus +3, Intimidate 8 ranks.
Really Demoralizing Attack
The Hero may spend one action point to make a single melee attack as a full round action. If the attack is successful, it deals only nonlethal damage. The Hero may then make a free Intimidation attempt against all opponents who can see the attack. The Hero adds a bonus to his Intimidation check equal to the damage dealt.
Prerequisite: Demoralizing Attack, Base attack bonus +6, Intimidate 12 ranks.
Why Won’t You Die?
Whenever the Hero has less than 0 hit points and is not unconscious or dead, he receives a bonus to his Intimidate checks equal to his character level. He may also spend one action point to make Intimidate checks as an attack action.
Prerequisite: Remain Conscious, Con 16+