4e: I was reading through ENWorld and read someone's idea on martial powers. He thought encounter and daily powers should only be available after "scanning" each foe. I think that's a cool idea, so here's a quick run-down on that.
Each martial character starts out with no access to any Encounter or Daily powers normally available to them at the start of an encounter. Tally up how many Encounter and Daily powers you have, and assign a number to them.
As a minor action, you may examine an enemy for weak spots. When you do this, roll a dice large enough to contain all the encounter and daily powers you possess. Any numbers outside of this range are re-rolls. Whatever you roll is the encounter or daily power you may use on the target. Once used, that power is no longer available for future rolls. Each time you want another encounter or daily power, you must spend a minor action to randomly roll for it. You must be engaging a target each time.
Each time you roll on the table you get a +1 to attack and a +3/tier to damage until the end of your next turn.
Utility powers are untouched, regardless of power source.