How is Conjuration exp earned? I know it's not by the # of summons anymore. Is it based on the number of strikes that a conjured weapon/familiar lands?

Also, I assume targeted based spells are the same as usual, but what about ones that go by "XX per second"? If I were to just use healing spells all day on myself, would I keep earning XP?

I think you do get experience for summoning, but I know it builds up every time the summoned creature takes damage. Summon things and beat them to death to build Conjuration and an attacking skill both up. Most other things need to actually hit a target. For healing, you must actually be recovering health. Using a healing spell while at full health does not increase Restoration skill.