Features
Offensive
Hunter’s Quarry (Ranger) - PH1 104 - Once per turn as a minor action, you can designate the enemy nearest to you as your quarry. Once per round, you deal extra damage to your quarry. The extra damage is based on your level (1st–10th +1d6, 11th–20th +2d6, 21st–30th +3d6). If you can make multiple attacks in a round, you decide which attack to apply the extra damage to after all the attacks are rolled. The hunter’s quarry effect remains active until the end of the encounter, until the quarry is defeated, or until you designate a different target as your quarry. You can designate one enemy as your quarry at a time.
Battlefield Experience (Battlefield Archer) - PH1 113 - You can designate more than one creature as your quarry at a time, up to a number equal to your Wisdom modifier. In addition, any attack made against a quarry receives a +1 bonus to attack rolls.
Lethal Hunter (Heroic Feat) - PH1 198 - The extra damage dice from your Hunter’s Quarry class feature increase from d6s to d8s.
Hobbling Strike (Heroic Feat) - MP2 137 - Whenever you would deal Hunter's Quarry damage, you can forgo one die of that damage to slow the target until the end of your next turn.
Prime Shot (Ranger) - PH1 104 - If none of your allies are nearer to your target than you are, you receive a +1 bonus to ranged attack rolls against that target.
Archer’s Action (Battlefield Archer) - PH1 113 - You can spend an action point to reroll one ranged attack roll or ranged damage roll, instead of taking an extra action.
Elven Precision (Heroic Feat) - PH1 194 - When you use the elven accuracy power, you gain a +2 bonus to the new attack roll.
Weapon Expertise (Heroic Feat) - PH2 190 - Choose a weapon group. You gain a +1 bonus to attack rolls with any weapon power you use with a weapon from that group. The bonus increases to +2 at 15th level and +3 at 25th level.
Vicious Advantage (Heroic Feat) - PH3 185 - You gain combat advantage against immobilized targets and slowed targets.
Point-Blank Shot (Paragon Feat) - PH1 204 - If you make a ranged attack against a foe within 5 squares of you, your attack ignores cover and concealment, including superior cover but not total concealment.
Duelist’s Bow (Item) - AV2 17 - When you hit an enemy with this weapon, that enemy takes a -1 penalty to ranged and area attack rolls until the end of your next turn.
Bracers of Archery (Item) - AV1 115 - Gain a +2 item bonus to damage rolls when attacking with a bow or crossbow.
Defensive
Archer Fighting Style (Ranger) - PH1 104 - Because of your focus on ranged attacks, you gain Defensive Mobility as a bonus feat.
Defensive Mobility (Bonus Heroic Feat) - PH1 194 - Benefit: You gain a +2 bonus to AC against opportunity attacks.
Nightmare Ward Armor (Item) - AV2 11 - Resist 10 psychic, and you gain a +2 item bonus to saving throws against charm, fear, or psychic effects.
Boots of the Fencing Master (Item) - AV1 127 - When you shift, gain a +1 item bonus to AC and Reflex defense until the end of your next turn.
Support
Group Awareness (Elf) - PH1 40 - You grant non-elf allies within 5 squares of you a +1 racial bonus to Perception checks.
Misc
Fey Origin (Elf) - PH1 40 - Your ancestors were native to the Feywild, so you are considered a fey creature for the purpose of effects that relate to creature origin.
Wild Step (Elf) - PH1 40 - You ignore difficult terrain when you shift (even if you have a power that allows you to shift multiple squares).
Light Step (Heroic Feat) - PH1 198 - Benefit: For the purpose of hourly or daily travel rates, add 1 to your overland speed and the speed of all allies in your traveling group. Add 5 to the DC required to find or follow your tracks. If traveling with allies, you can share this benefit with up to five other characters. You gain a +1 feat bonus to Acrobatics checks and Stealth checks.
Ornament of Alertness (Item) - AV1 153 - Gain an item bonus to Perception checks equal to the ornament’s enhancement bonus.
Gloves of Agility (Item) - AV1 134 - Gain a +1 item bonus to Acrobatics, Stealth, and Dexterity checks (but not Dexterity attacks).