I don't have a problem with specialization and I think it's necessary in certain industries, but one thing that has really helped me professionally is having a diverse set of skills. I didn't intentionally plan to develop them, but they've come in handy when different parts of the job market have imploded.

So if I were looking for a job right now, I'd look for one where I have the potential to learn how to do a lot of different things. (Startups are usually good for that, by the way.) And I'd work on developing at least one technical skill outside of my primary area of interest and employment. Think of it as a hedge. If your job at the teeny tiny literary magazine implodes, you can still code in php. (In my case, when magazine writing falls off a cliff, I can build a valuation model for one of my old hedge fund clients or make wireframes for a web client.)

It may not seem worth the investment now, but going forward it's the only thing resembling job security that this generation is going to have. My dad has worked for the same company for over 40 years and even he thinks those jobs don't exist anymore. So you have to be flexible and versatile.

I'd also recommending finding a job that won't prohibit you from pursuing some small alternative means of income on the side (as long as it doesn't interfere with your primary job, of course), even if it's just writing an article once a month or having Etsy store. It probably won't save you if you lose your job, but learning to monetize your other skills is important if you want to do anything with them long-term. And the best time to experiment is when you don't need to--when you already have a fairly secure job and don't need the work.