Two years ago, as my job hunt was becoming desperate, I took Alice's advice and started emailing principals about my availability should they find themselves with any unfilled positions. Not just principals at schools with posted openings, but all principals that might have an opening I could fill, which for me meant all middle and high schools. Those emails led to a one year position in a very large district, which was my foot in the door, as I am still with that district, now in a tenure-track job. I just want to remind everyone still looking that a lot of schools find themselves with unexpected openings in the week or two before school starts. If you haven't done so, I strongly recommend you start emailing principals. My cover letter served as the text of my email and I attached my resume as a PDF. The subject heading was something like: Math/Biology teaching positions I know how demoralizing the job search can be, but Alice's insistence on trying this approach really did get me that first job, so hopefully this post will encourage someone else to go ahead and start sending those emails. Best of luck to all still looking.