I've been digging for feats from various sources that would help expand the current selection, and maybe diversify the characters out there. If you've got a few you've been dying to see post them here, and maybe we can get some Developer attention.

Ranger Favored Enemy Feats:
Slayer of
Prerequisites: Favored Enemy, Ranger Level 9
Benefit: You deal an additional point of damage per ranger level to your favored enemies.

Favored Enemy Striker
Prerequisites: Favored Enemy, Ranger Level 5
Benefit: You apply your favored enemy damage bonus to hit when attacking a favored enemy.

Fighter Bonus Feats
Great Weapon Quickness
Prerequisites: STR 20, DEX 14, Greater Two-Handed Fighting, Base Attack Bonus +12
Benefit: Your mastery of this style reflects strengthened wrist muscles and honed reflexes, you gain an extra attack each round with two handed weapons. (Translates to a 15% attack speed increase in DDO)
Special: A fighter may select Great Weapon Quickness as a fighter bonus feat.

Pack Attack
Prerequisites: Combat Expertise, Base Attack Bonus +6
Benefit: You are always considered to be flanking an opponent so long as an ally is also attacking that opponent.
Special: A fighter may select Pack Attack as a fighter bonus feat.

Brute Force
Prerequisites: STR 15
Benefit: While calculating damage (and damage only) consider your strength 2 points higher than it actually is.
Special: A fighter may select Brute Force as a fighter bonus feat.

Improved Weapon Finesse
Prerequisites: DEX 16, Weapon Finesse, Base Attack Bonus +5
Benefit: You apply your dexterity modifier to damage with weapons that are usable with the Weapon Finesse Feat.
Special: A fighter may select Improved Weapon Finesse as a fighter Bonus Feat

Metamagic Feats
Raw Magic Attack
Prerequisites: -
Benefit: You infuse your damaging spells with raw magic energy removing their elemental damage type, and causing them to deal Raw Energy Damage. A Raw Magic Attack Spell uses a spell slot 2 levels higher (+15 SP)

Destructive Force
Prerequisites: -
Benefit: You increase the damage dice cap of spells by 50% (A spell with a 10d* cap would be increased to 15d*). A Destructive Force Spell uses a spell slot 1 level higher (+5 SP)

Mass Effect Spell
Prerequisites: Ability to cast 4th level Arcane or Divine spells.
Benefit: A single target spell enhanced with Mass Effect Spell affects an additional 1 target per level within 30ft of the original target. A Mass Effect Spell uses a spell slot 3 levels higher (+25 SP).

Transfer Spell
Prerequisites: -
Benefit: You may cast spells with with a range of Personal as touch spells. A Transfer Spell uses a spell slot 1 level higher (+5 SP)

Bardic Music Feats
Lasting Inspiration
Prerequisites: Bardic Music class feature, Perform 7 ranks
Benefit: You double the duration of your bardic music effects.

Music of the Gods
Prerequisites: Bardic Music, Perform 9 ranks
Benefit: You can affect creatures immune to mind affecting effects with bardic music, but they receive a +5 bonus to their will saves.

Divine Feats
Divine Deathward
Prerequisite: Ability to turn/rebuke undead CHA 13, Extra Turning
Benefit: You may expend a use of turn undead to cast the spell Deathward.

Divine Wrath
Prerequisite: Ability to turn undead, CHA 13, Improved Turning
Benefit: If you turn an undead regardless of a comparison of it's hit dice to yours you destroy it.

Soothing Word
Prerequisite: Ability to turn/rebuke undead
Benefit: You may expend a use of turn undead to cast a remove feat spell on everyone with 30ft of yourself.

Burial Rite
Prerequisite: Ability to turn undead, CHA 13, Divine Wrath
Benefit: Undead that are not turned by your turn undead attempt are sheathed in positive energy dealing 1d6 points of damage per level of the class granting your turn undead attempt.

I'll probably have more later.