I'm trying to go deep in two things right now: Ruby and JavaScript. The frameworks and new popular languages don't matter to me right now, my goal is to become an expert in Ruby and JavaScript because I know I'll be able to transfer those skills to the next popular language when the industry changes. But just doing weekend tutorials on every new technology is not going to get you anywhere. Anyone can learn a little about a lot.

Point is, get really really good at one or two things and you'll be able to transfer easily. Doesn't matter what those one or two things are.