I'm confused by the paladin's lay on hands ability. It may need errata.
Target: One creature
Effect: You spend a healing surge but regain no hit points. Instead, the target regains hit points as if it had spent a healing surge. You must have at least one healing surge remaining to use this power. (PHB 91)
What is a valid target for this power?
“Creature” or “creatures” means allies and enemies both, as well as you. (PHB 57)
So far so good. The target is one creature, you are one creature, you can target yourself. Simple.
The intent is not so clear. You regain no hit points from spending a healing surge, and then you gain hit points as if you had spent a healing surge. Wait, what?
The fluff description says that a paladin can "grant their comrades additional resilience with a touch of their hands and a short prayer". No mention of using the ability on yourself.
The Healing Hands feat says that when you "use the lay on hands power, the affected ally regains additional hit points equal to your Charisma modifier". "Ally" doesn't include yourself in 4.0 so if you can target yourself with lay on hands this is an oddly worded feat.
And some powers, like the cleric's Cure Light Wounds or the wizard's Jump have "Target: You or one creature", which is unnecessary if "One creature" includes yourself.