I thought it would be fun to spice up the class packages a little more, so here are some ideas for new class abilities you could add to the classes.
Cleric: Vessel of the Divine (encounter). When you are about to use a power, as a free action you can become an ally for purposes of that power.
Fighter: Reliable Strike (encounter) When using an encounter power, you can give that power the reliable keyword.
Paladin: Divine Sacrifice (encounter) As a free action when you are about to use a power, use can sacrifice 1 healing surge (with no healing) to gain an extra die roll (or W die) to the damage if the power hits.
Ranger: Already has twin strike as a class ability, don't know what else they would need
Rogue: Assasin's Strike (encounter). As a minor action, the crit range of your attacks increase by 1 until the end of your next turn.
Warlord: Veteran of Battle (encounter): When you are about to use a power, as a free action you can become an ally for purposes of that power.
Warlock: One with the Shadows (encounter): When using shadow walk, as a free action you gain total concealment.
Wizard: Instant Recall (daily). As a free action, you instantly swap one of your daily or utility powers with another one of the same level in your spell book. If the power of that level has already been used, you do not gain a new use of it.
Cleric: Vessel of the Divine (encounter). When you are about to use a power, as a free action you can become an ally for purposes of that power.
Fighter: Reliable Strike (encounter) When using an encounter power, you can give that power the reliable keyword.
Paladin: Divine Sacrifice (encounter) As a free action when you are about to use a power, use can sacrifice 1 healing surge (with no healing) to gain an extra die roll (or W die) to the damage if the power hits.
Ranger: Already has twin strike as a class ability, don't know what else they would need

Rogue: Assasin's Strike (encounter). As a minor action, the crit range of your attacks increase by 1 until the end of your next turn.
Warlord: Veteran of Battle (encounter): When you are about to use a power, as a free action you can become an ally for purposes of that power.
Warlock: One with the Shadows (encounter): When using shadow walk, as a free action you gain total concealment.
Wizard: Instant Recall (daily). As a free action, you instantly swap one of your daily or utility powers with another one of the same level in your spell book. If the power of that level has already been used, you do not gain a new use of it.