Okay, so here is a glitch that recharges your magicka by repeatedly summoning familiars.

http://www.youtube.com/watch?v=cfjXyskQ_5w

Also, I was able to use Sparks with 0 magicka for quite some time. Is that normal?

Bumpity

How was this a glitch? All you did was keep using magic spells and when you werent casting anything your mana went back up. Not a glitch bud, just how the game works..

My magic starts around 20% before I cast the first spell. Then the spells start giving me back the magic for the summon AND bonus magic. After each spell, look how much my magic goes up. My magic goes up SLOW normally by the way. I have the atronoch sign.

Wait, I think I see what you mean. So magic regenerates while you are holding spells?

If you have the atronach sign, you have 50% chance to absorb any spell.

Including conjuration spells you cast yourself. Not sure if this is bug feature, I don't remember it from previous games.