Buttons & Books

I have spent the last couple of days adding some buttons to my app. I don't know if I'm back up to speed, or if the books I bought are really helping, or it's the Buffy "Once More, With Feeling" soundtrack I've been listening to, or what, but it has gone pretty smoothly!

About the books, here's what I picked up at Powell's:
So far the first two have come in handy.  Hoping the last two help when I need to see "under the hood".