Say It Like You Mean It! and
A Little Bit Louder Now! were titled to fit in with the minor cheerleading theme. Nathan joining the cheer squad sets the whole story and sequel off, and it just seemed to fit so nicely. That, and the fact that a central problem is lying, so Nathan doesn't say what he means.
I Can't Hang was literally the first thing that popped in my head when working on it in ninth grade. Kyle is a pessimist and needs facts, so he 'can't hang' with just opinions. And he 'can't hang' on earth because he's an angel.
Spin had a lot of bad titles before I settled on the one it has right now. The original one I had in fifth grade was
Underneath. (I think so, anyway.) Then in junior high I called it
The Fame of Infamy, which made absolute jack crap sense. But ultimately I named
Spin after the Taking Back Sunday song, honestly, because it sounded neat and fit with the chaotic atmosphere of the Underland.