I've been saying for a while now that I really need to step outside of WordPress and learn more about PHP development. The hard part has been working it in to a week filled with client work and family, and relaxing at some point.
My friend Eric has a good way to do it. I really just need to pick an hour a week and book it for learning something new. I'm good at sticking to a schedule when I make one so maybe I've just put off writing it down as an avoidance tactic.