Just putting together a few feats for Thri-kreen, and thought I'd share.
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Thri-Kreen Feats
Claw AmbushPrerequisite: Thri-kreen, rogue
Benefit: When you hit a creature with your thri-kreen claws racial power, that creature grants you combat advantage until the end of your next turn.
Clutch ProtectorPrerequisite: Thri-kreen
Benefit: Adjacent allies gain a +1 bonus to all defenses against attacks by creatures marked by you.
Grasping Claws Prerequisite: Thri-kreen
Benefit: You gain a +1 bonus on grab attacks. When you grab a creature, it takes a -2 penalty on escape checks to escape the grab. In addition, once per turn you can sustain a grab as a free action instead of a minor action.
Helping HandsPrerequisite: Thri-kreen
Benefit: Once per turn, when you fail a Thievery check you can re-roll the failed check. You must use the second result, even if it is lower.
Hunter's RecallPrerequisite: Thri-kreen
Benefit: When you make a monster knowledge check, roll twice and use either result.
Hunting Pack LeaderPrerequisite: Thri-kreen, warlord, Commanding Presence class feature
Benefit: When an ally you can see spends an action point to make an attack, that ally gains combat advantage against any enemy adjacent to itself and at least one other ally.
Instinctive AmbusherPrerequisite: Thri-kreen, battlemind, speed of thought power
Benefit: When you use your speed of thought, use your Dexterity modifier in place of your Charisma modifier to determine how far you move.
Memories of PowerPrerequisite: 11th level, thri-kreen, Psionic Augmentation class feature
Benefit: When you are first bloodied in an encounter, you regain 1 power point.
Multi-Claw Grappler
Prerequisite: Thri-kreen
Benefit: Your lower arms count as one hand for the purposes of grabbing. If you are not grabbing a creature with your lower arms, you count as having a free hand for grab attacks and attack powers that let you grab a creature. This feat does not give you the ability to make attacks with your lower arms.
MultidexterityPrerequisite: Thri-kreen
Benefit: While wielding a melee weapon in each hand, you gain a +2 feat bonus to the damage rolls of weapon attacks that you make with a melee weapon, and to the damage roll of your thri-kreen claws racial power. The bonus increases to +3 at 11th level and +4 at 21st level.
Overpowering ClawsPrerequisite: 11th level, thri-kreen
Benefit: If you target only one creature with your thri-kreen claws racial power and hit it, you deal 3 extra damage and knock the target prone. The extra damage increases to 4 at 21st level.
Raging Claw FrenzyPrerequisite: Thri-kreen, barbarian
Benefit: When you are raging, once per turn as a minor action you can deal 2 damage to one adjacent enemy. This damage increases to 3 at 11th level and 5 at 21st level.
Remembered Weapon TalentPrerequisite: Thri-kreen
Benefit: You gain proficiency with the chatkcha and the gythka and a +2 feat bonus to damage rolls with such weapons. The bonus increases to +3 at 11th level and +4 at 21st level.
Restraining ClawsPrerequisite: 11th level, thri-kreen
Benefit: When you are grabbing a creature, the creature is restrained instead of immobilized.
Thri-kreen SoulPrerequisite: Revenant, thri-kreen
Benefit: You gain the
thri-kreen claws thri-kreen racial power. In a given encounter, you can use either your
thri-kreen claws racial power or your
dark reaping racial power.
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Old Thoughts
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Some thoughts:
These were thrown together quickly - I'll probably add more later. Grasping Claws might be iffy, mechanically (it lets you wield two weapons, or a two-handed weapon, while grabbing). Multi-Weapon Training isn't that special - no proficiencies, but the same scaling feat bonus as other racial weapon trainings. I wanted something that made the race with four arms better at fighting with multiple weapons than other races. Raging Claw Frenzy is probably iffy as well, if only for the minor action. I guess it could be changed to: "While you are raging, when you make an attack you can deal 2 damage to one adjacent enemy that is not the target of the attack." Hm. Sounds better. Remembered Weapon Talent is a traditional racial weapon training feat. However, it only gives a limited selection of weapons, and a limited bonus. Probably comparable to Xendrik Weapon Training (which gives Long Knife and Xendrik Boomerang).
Long time, no update, eh?
Added the Thri-kreen Soul feat - really a Revenant racial feat, but it seemed appropriate here. Kind of obvious, but it came up in discussion, so... 
