I'm looking for videos on ionic compounds

I have a few minutes to get this off since my last class got off a few minutes early.
Okay, so here it is: Today we started the second leg, for lack of better language, of my chemistry course even though the exam on the first part is tomorrow (okay, fine).  It really didn't take very long for me to get lost again...I mean, I'm not totally clueless, but it didn't take long for questions to start piling up.
So, I'm going to be on the hunt for videos about ionic and covalent compounds, in particular I'm looking for how they're formed and how you derive the formulas for said compounds.  (@ScaredandScarred: Since I'm letting you act as a helper, I left you more specific questions so you can use what you've gathered to go site hunting as you have.)
So, there's your cue if you want to jump in.  I probably won't be able to start working on the text material until the weekend, after the exam, and I'll be looking for videos too because it wouldn't be fair if I didn't, but you want to get the jump on me, go for it.